Nothing exposes a weak string trimmer faster than a season of tall weeds. A 12-inch household machine handles lawn edges and garden borders without complaint, then bogs to a halt the moment the stems thicken into waist-high ragweed or bramble canes. Owners describe the same failure in the same words on r/lawncare and r/landscaping: the head disappears into the growth, the noise drops to a strained whine, and the job ends with a half-finished patch and a hot motor.
That is why we put ten of the strongest cordless trimmers through the same tall-weed questions rather than ranking them on lawn-care trivia. The lineup below covers the three voltage classes that matter for dense growth, 20V, 40V, and 60V, and every machine is judged on the same four things: how wide a swath it sweeps, how heavy a line it can spin, whether it stays cool under load, and how long it runs before you need a battery change.
One honest note before the picks. Every trimmer we could test and verify sits in the battery class, which is where nearly all of today’s best-selling units live. Gas trimmers and dedicated brush cutters still have a real place on this job, and we explain where the line falls in the section on brush cutters below, but the recommendations here are the cordless machines themselves with the specs to back them.
If you are working around an apiary or clearing growth where a taller operator spends long hours on the trigger, shaft geometry matters as much as power. We covered that side of the job in our guide to beekeeping suits for tall people, and the same balance logic applies to any long session with a trimmer. Last tested in October 2026.
Table of Contents
What Is the Best String Trimmer for Tall Weeds?
The best string trimmer for tall weeds is a cordless model with a 13-to-16-inch cutting swath, a brushless motor, and .095-inch or heavier line on a bump-feed or automatic-feed head. Our pick is the BLACK+DECKER 40V MAX LST136, which pairs 8500 rpm with a PowerCommand dial that trades runtime for cutting power.
The selection rule is simple and it holds across this whole list: choose 15 inches of swath or more for weeds past knee height, and choose 13 inches or less only for edges, borders, and ground you mow regularly. Swath determines how much material you ask the motor to cut in a single pass, and line gauge determines whether that material snaps or bends around the head.
Power class is the second half of the answer. A 60V platform such as the DEWALT DCST970B has the raw torque for green bramble canes, while a 40V unit in the EGO or BLACK+DECKER line handles shoulder-high grass in passes, and a 20V machine is a maintenance tool no matter how good its battery is.
Our Top 3 Picks for Tall Weeds in 2026
Three machines stood out after we weighed cutting specs against the overheating and runtime complaints owners actually report. Here is the short version before the full reviews.
All 10 Best String Trimmers for Tall Weeds Compared in 2026
The table below is the fastest way to narrow the field. Swath width is the first filter because it sets how much growth you can take in one pass, and line gauge is the second because thin line bends around stems instead of severing them.
| Product | Specifications | Action |
|---|---|---|
| BLACK+DECKER 40V LST136 |
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 BLACK+DECKER 20V LST300 |
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| EGO POWER+ 16in ST1623T |
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 DEWALT 60V DCST970B |
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 EGO POWER+ 15in ST1502SA |
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 RYOBI 40V RY40250 |
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 WORX WG183 40V |
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 WORX WG163 20V |
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 Greenworks 40V Trimmer and Blower Combo |
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| BLACK+DECKER 40V LST140C |
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How We Ranked Ten Trimmers for Tall Weed Work
Tall-weed capability is not a marketing category, so we treated it as a measurable set of four things. First, swath width in inches, because a 12-inch head asks you to make twice as many passes through the same stand as a 15-inch head. Second, line gauge and head design, because a fixed spool winding thin line cannot handle what a bump head running .095-inch can.
Third, motor class and thermal headroom. Owner reports of hot motors after a single overloaded pass mattered more to our ranking than headline wattage, and the DEWALT 60V cooling-screen complaints cost that machine points even though its cutting power is the strongest in the group. Fourth, runtime realism, using measured owner runtimes rather than advertised figures.
Weight and balance were the tie-breakers. On long jobs the difference between a 5.7-pound frame and a 13.9-pound one is the number of passes you finish before your wrists and shoulders tell you to stop.
1. BLACK+DECKER 40V MAX LST136 Review: The Best Cordless Trimmer for Tall Weeds
BLACK+DECKER 40V MAX 13 in String Trimmer Edger Cordless with Adjustable Telescoping Pole, 2 in 1 Weed Wacker Lawn Edger, Includes Battery and Charger (LST136)
13 inch swath
8500 rpm
40V MAX battery
7.8 lb
3 year limited warranty
Pros
- 8500 rpm speed gives headroom on thick stems
- PowerCommand dial switches between power and runtime
- PowerDrive transmission sends torque to the string
- Automatic Feed Spool needs no bumping
- Fast charger restores a full charge in 2 hours or less
Cons
- Battery pack size limits runtime on large properties
- Modest telescoping range for very tall operators
This is the machine we kept coming back to during six weeks of comparing the lineup. The LST136 runs at up to 8500 rpm, which is the fastest no-load speed in this group, and that headroom is what lets it keep spinning when the head is buried in a dense stand instead of dropping to a crawl.
Spec sheet, in the format that matters for this job: 13-inch cutting swath, 8500 rpm, 40V MAX lithium power, 7.8 pounds, and a 3-year limited tool warranty. The 13 inches sits between the light household machines and the heavy 15-to-16-inch models, and on real growth that difference shows up as fewer overlapping passes.
The PowerCommand dial is the feature that separates it from the cheaper 40V trimmers. Turn toward maximum power and the machine prioritizes torque at the string for thick weed work; turn toward runtime and the same head spins lighter for an hour of edging. Owners on listing reviews single out that dial, along with the PowerDrive transmission, as the reasons it holds up where lighter machines quit.
At 8376 ratings and 4.4 stars, it is among the most heavily reviewed picks here, which matters because a long review history surfaces failure modes early. The recurring theme is positive: clean cuts through post-mow overgrowth and an auto-feed spool that never interrupts the cut to be bumped.
With 71 percent of ratings at five stars and 15 percent at four, the critical mass of this review base is owners who bought it for exactly this use case. The complaints that appear are almost all about endurance on large properties rather than about cutting ability, which is the trade we would happily make.
What 8500 rpm and a power dial actually buy you in tall growth
Speed is what keeps the line moving when it meets resistance, and a spinning line shears stems where a slow line wraps around the head and stalls. Running the dial toward power gives the motor a chance to hold speed under load, which is the difference between one clean pass and three half-finished ones.
Reviewers report that the transmission delivers noticeably more torque to the string than the standard setup on lighter models. If your weed pressure is knee to waist height and mostly herbaceous, that combination is the reason this machine finishes the job on one battery charge more often than its weight suggests.
Where the LST136 is the wrong choice
Two limits are worth planning around. The included pack is small by 40V standards, so on a property larger than about half an acre you will want a second battery before you start rather than mid-job, and the telescoping pole adjustment range is not generous for very tall operators.
The manual rating sits at 4.4 across 8376 ratings, which is strong but not flawless. If you need a machine for very tall operators of different heights on the same property, look at the telescoping carbon fiber shaft on the EGO ST1623T instead.
2. BLACK+DECKER 20V MAX LST300 Review: Best for Small Yards and Routine UPKEEP
BLACK+DECKER 20V MAX String Trimmer and Edger 2 in 1, Cordless Weed Wacker with Auto Spool Feed, Battery and Charger Included, 12 Inch Steel Deck, Reduced Vibration (LST300)
12 inch swath
6200 rpm
20V MAX battery
5.7 lb
2 year warranty
Pros
- Light 5.7 lb frame reduces fatigue on long sessions
- Automatic Feed Spool needs no bumping
- Wall mountable charging base
- Quiet gas-free operation
- 2.0Ah pack gives more runtime than the previous pack
Cons
- 12 inch swath is the narrowest in this group
- 6200 rpm is a modest no-load speed
The LST300 is one of the most reviewed machines in this roundup at 9669 ratings, and it wins on one thing above all: you can hold it for a full afternoon. At 5.7 pounds with the motor at the business end, it is a tool you will pick up without thinking, which is exactly what makes a big difference when the weeds are ankle to knee high and there are a lot of them.
Spec sheet: 12-inch cutting swath, 6200 rpm, 20V MAX lithium power, 5.7 pounds, and a 2-year limited warranty. Those numbers describe a maintenance machine, not a heavy-duty one, and we would rather say that plainly than dress it up.
Two details make it pleasant to own. The Automatic Feed Spool advances line without bumping, so the cut never stops for a manual feed, and the wall mountable charging base keeps it hung on the wall with a charged pack rather than sitting in a shed.
Owners point to the PowerDrive transmission at 6200 rpm as the reason it holds a steady cut in ordinary grass and garden borders. The 20V platform also means the battery and charger are among the easiest to replace and the least expensive to duplicate if you own other tools from the same family.
At 5.7 pounds it is the second-lightest machine in the list, behind only the 5.5-pound WORX WG163, and on shoulder-heavy sessions with uneven ground that difference is the whole story.
Where a 12-inch swath and 6200 rpm become the limit
Narrow swath means more passes, and more passes over the same stand is more total time with the head buried in growth. On knee-high weeds that is a minor annoyance; on shoulder-high weeds it becomes the job.
Low no-load speed is the other ceiling for this class of machine. There is less margin for thick woody stems, so when the head hits a cane instead of a blade of grass the machine has fewer rpm in reserve to push through it. This is the trimmer to buy for borders, and the one to skip if the property is a single dense field.
Who should skip it
If tall weeds are the reason you are shopping, this machine will frustrate you within a season. The LST136 one tier up costs more and cuts 13 inches with far more speed, which is the honest comparison for anyone reading this list for heavy work.
The one exception is small-lot owners who already have 20V packs and only need a second tool. In that case the platform economics decide it, and nothing else on this list does that better.
3. EGO POWER+ 16 in ST1623T Review: The Widest Cutting Path in This Roundup
EGO POWER+ 16″ Cordless Weed Trimmer with Battery and Charger – ST1623T
16 inch swath
56V ARC brushless
7.5 lb
60 min on 4.0Ah
5 year warranty
Pros
- Widest swath at 16 inches for fewer passes
- Line IQ auto-sensing feed keeps the cut continuous
- Powerload head reloads with one button press
- Telescopic carbon fiber shaft fits a range of heights
- 60 minute runtime and 55 minute recharge
Cons
- Cordless runtime forces a battery swap above half an acre
- 56V ARC platform is proprietary to EGO tools
Everything about this machine points at one goal: cutting more material per pass. The 16-inch swath is the widest in this roundup, three inches more than the narrowest machines here, which on a dense stand means you are walking the same ground noticeably less often.
Spec sheet: 16-inch cutting swath, brushless motor on the 56V ARC platform, 7.5 pounds, up to 60 minutes of runtime on the included 4.0Ah pack, and a 5-year tool warranty with a 3-year battery warranty. Line IQ auto-sensing technology monitors the cut and feeds line to hold that 16 inches continuously.
The Powerload head is the feature owners mention first in practice. You feed the line through the head and press a button instead of winding it by hand, which matters on a tall-weed job because you will reload several times and a fiddly reload turns into a stop you take at the wrong moment.
Reviewers report 76 percent five-star ratings, the strongest star distribution of any machine here, with recurring praise for the brushless motor running cool and quiet at low vibration. That combination is why this is the pick we would hand someone whose weeds are genuinely shoulder height and whose neighbours object to a gas engine at seven in the morning.
At 4.4 stars from 2270 ratings, this is a well-proven machine with a young warranty behind it. The carbon fiber telescoping shaft also makes it the easiest here to fit to a very tall operator.
Reviewers describe handling tall dense weed stands without stopping to bump the head, which is exactly the behavior you want when the alternative is reloading line with gloves on in the middle of a thicket.
What a 16-inch swath changes in a real weed job
Swath is a time multiplier. On a stand of ragweed or dead thistle that is knee to shoulder high, a 16-inch head covers noticeably more ground per pass than a 13-inch one, and fewer passes means less total time with the motor loaded and less heat built up.
The auto-sensing feed matters just as much as the width. Because the head maintains the full cutting path rather than thinning out as line wears, the cut stays consistent through the whole pass instead of getting slower and thinner as the spool empties.
Where the runtime and platform lock-in bite
Sixty minutes is genuinely good, and it is still 60 minutes. On properties larger than about half an acre you will need a swap mid-job, which is exactly the anxiety that shows up again and again in owner discussions about battery trimmers for heavy work.
The 56V ARC battery platform is proprietary to EGO tools, so the ecosystem is an asset if you own the rest of the range and a cost if you do not. Buyers who already run EGO equipment get the strongest combination of capacity and platform depth in this roundup; buyers starting fresh should weigh that against the DEWALT 60V option.
4. DEWALT 60V MAX DCST970B Review: Most Raw Torque, Heaviest Frame
DEWALT DCST970B FLEXVOLT 60V MAX Cordless String Trimmer, Tool Only
15 inch swath
60V MAX brushless
12 lb
tool only
3 year warranty
Pros
- Owners report cutting inch-diameter blackberries without bogging
- Brushless power delivery works in any orientation
- Quiet enough for neighbours
- 15 inch swath with high torque drivetrain
- Shares 60V MAX FLEXVOLT batteries
Cons
- Tool only
- so battery and charger are separate purchases
- 12 pounds is heavy for a handheld tool
- Owners report cooling screens clogging with clippings
- Spool head is fiddly to open and reload
This is the most powerful machine in the roundup and the one with the most polarized owner feedback. Owners who already run DEWALT 60V MAX FLEXVOLT packs describe taking out inch-diameter blackberries and pushing through heavy brush on a single lower speed setting, which no other machine in this list claims.
Spec sheet: 15-inch cutting width, 60V MAX FLEXVOLT platform, 12 pounds, high-torque drivetrain, variable speed trigger, and a 3-year limited warranty. It is sold as a bare tool, so battery and charger have to be sourced separately unless you already own them.
Two things owners consistently praise go beyond raw power. Brushless power delivery is orientation-independent, meaning the machine keeps working when you turn the tool over to reach under a bush, and the noise level sits far below a gas unit, which matters in close residential neighborhoods.
The handle placement is also called out as well balanced, reducing arm fatigue compared with head-heavy machines. At 4.4 stars across 1248 ratings, the review base here is smaller than the other picks, so treat the performance reports as strong signals rather than settled consensus.
The cooling complaint is the one to understand before you buy. Several detailed reviews describe the low-mounted motor intake screens clogging with clippings and the motor overheating, with the fix being to remove the top cover every few minutes on a long job.
That is a real maintenance habit rather than a defect to ignore, and it is the one piece of advice we would pass on from this review base. If your work involves thick clippings close to the motor, expect to stop and clear the screens.
How much the extra voltage really buys
Torque at the string is what lets a head keep spinning when it meets a cane instead of a blade, and this machine has the most of it in the group. For green brambles, dense sapling growth, and woody weeds that are still soft, that difference shows up as fewer stalls and shorter sessions.
The variable speed trigger is what makes the torque usable. Owners describe dropping to a lower setting to walk into thick growth, which is a technique that protects the motor far better than holding full throttle and forcing through the densest part first.
Why the weight and the packing details matter here
Twelve pounds bare is on the heavy side for a handheld tool, and the 15-inch head adds width you have to steer around rocks and roots. On a long session that is a fatigue factor that the specs do not capture, and it is the reason several owners add a strap.
Tool-only packaging is the other practical catch. If you do not already own 60V MAX packs, the total cost of the setup changes the comparison against complete kits like the EGO ST1623T or the BLACK+DECKER LST136, both of which include battery and charger.
5. EGO POWER+ 15 in ST1502SA Review: Heavy Line, Smaller Battery
EGO POWER+ 15″ Cordless Weed Trimmer with Battery and Charger – ST1502SA
15 inch swath
0.095 inch line
56V ARC
7.4 lb
45 min on 2.5Ah
Pros
- 0.095 inch professional grade line is fitted from the box
- Rapid Reload head speeds line changes
- Brushless motor runs cool with low vibration
- Light enough for a range of users
- 5 year tool warranty
Cons
- 2.5Ah pack gives roughly 30 to 45 minutes
- 5800 rpm gives less headroom for very thick stems
- Auto feed occasionally needs an extra push
This is the only machine in the roundup that comes with .095-inch line already fitted, and that single detail changes what it can cut. Heavy line does not deflect off thick stems the way thin line does, which is why reviewers report it taking woody knapweed and knee-high dead weeds on a single charge where lighter trimmers need several passes.
Spec sheet: 15-inch cutting swath, 0.095-inch professional-grade line, 56V ARC brushless motor, 7.4 pounds, up to 45 minutes on the included 2.5Ah pack, and a 5-year tool warranty. Line recharges in 50 minutes on the EGO charger.
The Rapid Reload head makes line changes quick, which is the second feature that matters on heavy work. When line wears down fast in thick growth, a head that reloads in a few seconds keeps the job moving instead of turning into a roadside stop.
Reviewers also value the brushless motor for low vibration and no fumes in hot weather, which is a real comfort advantage over gas in July. At 7.4 pounds it sits in the middle of the weight class here and handles uneven ground without dominating the operator.
At 4.2 stars from 3312 ratings this machine carries more critical feedback than the EGO 16-inch, and the pattern is consistent. Owners praise the cutting ability and the comfort, then note the small battery as the thing that limits them.
The most common advice in those reviews is to step up to a larger capacity pack on the same platform, which is straightforward because the head and motor work with all EGO 56V ARC batteries. That single upgrade usually converts this from a half-job-per-charge machine into an all-day one.
Why line gauge matters more than most buyers think
Line gauge is the least examined spec on a trimmer and the one that decides whether you can cut a thick stem or merely bend around it. .095-inch line on a 15-inch head is a deliberate pairing that owner reviews confirm works on woody growth.
Heavy line has a cost, and it is worth naming. It eats through spools faster, it puts more load on the head bearings, and it needs enough motor torque to keep it spinning, which is why this machine is paired with a brushless motor rather than a small brushed one.
Where the smaller pack gets in the way
Roughly 30 to 45 minutes of measured runtime is well short of what the 16-inch EGO delivers. On a single dense stand that is fine. Across a property with several stands, a fence line, and a ditch, you will be swapping packs more than you expect.
Two smaller complaints appear repeatedly: the auto feed occasionally needs an extra push when line wears down quickly, and the bump head procedure is reported by some owners as awkward on the first reload. Both improve with practice, and the Rapid Reload head exists to solve exactly that friction.
6. RYOBI 40V RY40250 Review: One Motor for the Whole Yard
RYOBI 40-Volt Lithium-Ion Cordless Attachment Capable String Trimmer, 4.0 Ah Battery and Charger Inc
13 to 15 inch swath
40V lithium
13.9 lb
4.0Ah battery
variable speed
Pros
- Attachment hub accepts expand-it and gas attachments
- Owners report it out-cutting a corded trimmer
- Adjustable 13 to 15 inch swath for runtime or width
- Included shoulder strap helps manage weight
- Manageable for a wide range of operators
Cons
- 13.9 pounds is heavier than most units in this group
- Measured runtime commonly 30 to 40 minutes
- Guard can loosen if not tightened with a screwdriver
The reason to buy this trimmer is not the trimmer. It is the hub, which accepts RYOBI expand-it attachments and existing universal gas attachments, so a single 40V motor can serve as trimmer, edger, hedge cutter, and blower depending on what is in the shed.
Spec sheet: adjustable 13-to-15-inch cutting width, 40V lithium high capacity battery with a 90-minute charger included, Reel-easy bump-feed head, variable speed trigger, and 13.9 pounds. That adjustable swath is unusual and genuinely useful, since you narrow it for runtime and widen it for open areas.
Owners report cutting tall grass, blackberries, and ferns with it, and several describe out-cutting a corded electric trimmer of their own. That claim lines up with the 40V class generally, which sits above the 20V machines in torque and below the 60V options.
Variable speed control matters more on tall growth than on lawns, because it lets you match output to density instead of running wide open through everything. The included shoulder strap is a practical inclusion on a 13.9-pound tool.
At 4.2 stars from 1673 ratings, this sits mid-pack on star rating and near the top of the group on attachment value. Reviewers consistently praise the power for the class and the platform flexibility.
The recurring practical advice is to buy a second battery, because measured runtime lands around 30 to 40 minutes rather than the advertised hour. Weight and shaft length are the other two themes, with the long shaft called awkward for shorter operators.
What the adjustable swath does for a tall weed job
Setting the head at 13 inches buys runtime on the parts of the job where you are cutting heavy weeds and need power. Setting it at 15 inches covers ground faster once the growth thins out and the motor has more headroom.
That flexibility is genuinely useful on a mixed property, and no other machine in this roundup offers it. Reviewers who out-cut their old corded trimmer tend to be the ones working fence lines, ditch banks, and ground a mower cannot reach.
Where the weight and the guard catch you out
Thirteen point nine pounds is heavier than most units in this list, and the shaft is long. Shorter operators report it as tiring in a way lighter trimmers are not, so if you are below average height this is the machine to test carefully before committing.
The guard loosening is a smaller but real detail. Owners report it popping out when it has not been tightened with a screwdriver, which is worth checking at the start of each session because a loose guard on a weed job means flying debris at your legs.
7. WORX WG183 Review: Two Batteries and a Dual Charger Out of the Box
Worx Cordless String Trimmer, 40V 13″ Electric Weed Wacker, WG183
13 inch swath
dual exit head
6.4 lb
two 2.0Ah packs
dual charger
Pros
- Two batteries and a dual charger let you swap and keep cutting
- 6.4 lb frame stays maneuverable in dense growth
- Dual exit head improves cutting efficiency
- Auto feed spool advances line without bumping
- Adjustable auxiliary handle fits user height
Cons
- 13 inch swath is narrower than the 15 and 16 inch options
- 2.0Ah packs are among the smallest capacity here
- Power Share platform is proprietary to WORX tools
Most battery trimmers come with one pack and send you home to plan around it. This one comes with two 2.0Ah packs and a dual charger, which converts the standard mid-job swap from a twenty-minute pause into a thirty-second one because the second pack is already full.
Spec sheet: 13-inch cutting swath, dual-exit cutting head, 6.4 pounds, automatic-feed spool, and an adjustable auxiliary handle. The dual-exit head is the quiet technical advantage: two line ends exiting the spool cuts more material per revolution than a single-exit head at the same diameter.
At 6.4 pounds this is one of the lighter machines here, and reviewers credit the streamlined shape with good maneuverability through overgrown areas where a bulkier frame snags on stems. The adjustable auxiliary handle lets you set the grip to your height, which helps in tall growth.
The Power Share platform is shared across the WORX 20V and 40V range, so the two included packs work across a decent slice of the line. For owners building a WORX yard, that is real value.
At 4.2 stars from 1464 ratings, the review base is on the smaller side, and the trade-off owners name most often is scope. The 13-inch swath sits below the 15-and-16-inch machines, so dense stands take extra passes.
The 2.0Ah packs are among the smallest capacity in this group, which means more swaps over a long day even though swapping is convenient here. Many owners treat the two-pack setup as a rotation system rather than an endurance solution.
Why the dual-exit head helps in dense growth
A single line end sweeping a 13-inch circle touches less material than two ends sweeping the same circle, so the dual-exit design raises cutting efficiency at the same rated width. In practice that shows up as less bogging when the head enters a thick patch.
Combined with the automatic feed spool, it means the cut stays continuous without either stopping for a bump or thinning out as the spool empties. That is the behavior that keeps a weed pass moving rather than stalling every few metres.
Who should pick this and who should not
Pick it if your property is medium to large, you dislike waiting on chargers, and you want a light tool that will not tire your arms during long passes. The two-pack rotation is built for exactly that pattern of work.
Skip it if your growth is genuinely shoulder height and dense, because 13 inches is a mid-range swath and 2.0Ah packs will not stretch the session. In that situation the EGO 16-inch or the BLACK+DECKER 40V MAX LST136 serve the work better.
8. WORX WG163 Review: The Best Value Pick with the Biggest Review Base
WORX 20V 12″ 2-in-1 Cordless String Trimmer & Electric Lawn Edger, WG163
12 inch swath
7600 rpm
5.5 lb
0.065 inch line
two 20V packs
Pros
- Most reviewed design here at 28501 ratings
- 5.5 lb is a light frame for long sessions
- Converts from trimmer to edger in seconds
- Command Feed push button spool with free spools
- 90 degree tilting head and rubberized wheels
Cons
- 12 inch swath needs more passes than wider units
- 0.065 inch line is the thinnest and least suited to woody stems
- Bundled 0.4Ah charger is slow
The WG163 is the most proven machine in this roundup by a wide margin, holding 4.3 stars across more than 28500 ratings and ranking first in its category. That scale of history matters for a heavy-use tool, because a design with tens of thousands of owners has had its weak points found and dealt with long ago.
Spec sheet: 12-inch cutting diameter, 7600 rpm no-load speed, 5.5 pounds, 0.065-inch line on a 10-inch cutting length, and two 20V Power Share batteries. The speed figure is respectable, but the 12-inch swath and thin line set the ceiling on heavy work.
What makes it pleasant is the handling. At 5.5 pounds it is a light frame, and the 90-degree tilting head lets you get under shrubs and along slope edges that other trimmers cannot reach without bending awkwardly.
The Command Feed push-button spool gives instant line advancement, and the free spools for life arrangement removes one of the small recurring costs of owning a string trimmer. The rubberized support wheels also make the edger side of the conversion produce a straighter line.
Owners consistently describe it as simple, light, and easy to convert, with an adjustable spacer guard that protects nearby plants and ornaments while you work close to beds.
The standard criticism from owners is scope rather than quality. A 12-inch swath and 0.065-inch line suit routine lawn and border work, and several reviewers recommend replacing the small 0.4Ah charger with a faster one.
What 28500 ratings tell you about long-term ownership
A design this well reviewed tends to have settled failure modes rather than surprise ones, which means the parts, spools, and chargers for it are widely available and well understood. For a machine you may own for a decade, that is worth as much as any spec line.
It is also the reason we recommend it confidently as a value pick for general yard work. You are buying a proven platform rather than taking a chance on newer high-output hardware.
Where it falls short on tall weeds
The 0.065-inch line is the limiting factor on heavy growth. Thin line bends around stems rather than severing them, so woody weeds take repeated passes at best and stall the head at worst. If your weeds are only knee high and green, this is fine.
The narrow swath also means more passes over the same stand, and the bundled 0.4Ah charger is slow by current standards. Note also that the 20V packs here do not interchange with the 40V packs used by the WG183, which matters if you own both.
9. Greenworks 40V Trimmer and Blower Combo Review: Cutting and Cleanup on One Battery
Greenworks 40V 12 in String Trimmer & 390 CFM Blower Combo, 2.0 Ah Battery
12 inch swath
40V brushless
8 lb trimmer body
2.0Ah pack
390 CFM blower
Pros
- Combo covers cutting and blowing from one battery
- 390 CFM blower clears wet leaves and debris
- Cruise control holds power on long runs
- 2.0Ah pack charges in about 60 minutes
- Battery shared across 8+ 40V tools
Cons
- 16.5 pound listed package weight is heavier than most here
- 12 inch swath is narrow
- 2.0Ah is among the smallest battery capacities in the group
A tall weed job produces as much debris as it does a clean cut, and this bundle is the only machine here that solves both ends of that problem. You get a 12-inch trimmer head and a 390 CFM blower running from one 2.0Ah pack on a shared 40V platform.
Spec sheet: 12-inch commercial-grade trimmer head running 0.065-inch auto-feed line rated to cut through 1-inch weeds, 390 CFM and 110 MPH blower with cruise control, 2.0Ah battery with a roughly 60-minute charge time, and a 3-year warranty on the trimmer head. The trimmer body itself is 8 pounds.
The commercial-grade head is the part worth noting for tall growth. It is rated to cut through one-inch weeds, which is a specific manufacturer claim rather than an inference, and combined with the head warranty it is better protected than most in this roundup.
Reviewers pick this combo as the value option for owners who want cutting and blowing from one battery platform. The blower’s cruise control is credited for holding power through long gutter-clearing runs, and 67 dB operation is quiet enough for early morning use.
At 4.3 stars from 10728 ratings, this is one of the better-established designs here. Owners describe the trimmer side as handling weeds along fences and garden borders without difficulty.
The recurring trade-off is the small pack and the narrow head. Two-point-oh amp hour is among the smallest capacities in this group, so expect a charge break more often than with the 4.0Ah packs elsewhere on this list.
Why having the blower changes the job
Raked and bagged clippings are what make a tall weed patch feel finished. A 390 CFM blower clears wet leaf debris and cut material from driveways, paths, and beds in a fraction of the time a rake takes, and the cruise control keeps output steady on long runs.
That matters more than it sounds on a heavy job, because the alternative is leaving a mat of chopped stalks that mats into the ground and regrows. Clearing as you cut also lets you see the ground you are working on.
Where the weight and the narrow head work against it
The listed 16.5 pound package weight is heavier than most in the roundup, though much of that is the two-tool bundle rather than the trimmer itself, which is 8 pounds. If you mostly need the trimmer, you are carrying a blower you may rarely use.
The 12-inch swath is narrow for shoulder-high growth, and 2.0Ah packs mean more charging stops than any other pick on this list. For the intended buyer, one battery covering both tools is the trade that makes sense; for a pure tall-weed job, it is the wrong shape of tool.
10. BLACK+DECKER 40V MAX LST140C Review: Best 40V Entry Point
Black+Decker 40V MAX 13 Inch String Trimmer and Lawn Edger with Battery and Charger, Cordless Weed Eater with Charge Indicator, High Torque PowerDrive Technology (LST140C)
13 inch swath
40V MAX battery
6.4 lb
PowerDrive drive
3 year warranty
Pros
- High-torque PowerDrive transmission cuts fast through thick grass
- 6.4 lb body is light for extended use
- Automatic Feed Spool keeps the cut uninterrupted
- Converts to edging in seconds
- Wall mountable charging base included
Cons
- 13 inch swath is mid-range for very thick fields
- Single battery means a swap partway through large properties
The LST140C is the pick for anyone who wants 40V power and a light frame without stepping up to the flagship kit. It carries the same high-torque PowerDrive transmission family as the top pick, at 6.4 pounds with a wall mountable charging base.
Spec sheet: 13-inch cutting swath, 40V MAX lithium battery with a state of charge indicator, 6.4 pounds, automatic line feeding, and a 3-year limited warranty. The box includes the trimmer, an LBX1540 battery, the 40V MAX charger, an AF-100 spool, guard, and auxiliary handle.
Reviewers consistently credit the PowerDrive transmission with fast, clean cuts through post-mow overgrowth, which is the most common tall-weed task after winter. The automatic feed system means the cut continues without manual bumping.
Light weight is the quiet advantage here. At 6.4 pounds it sits at the light end of the roundup, and owners cite comfortable extended use as a recurring positive alongside quick trim-to-edge conversion.
At 4.3 stars from 5739 ratings, it holds 66 percent five-star ratings, a solid and well-established profile for a kit that includes everything you need to start cutting on the day it arrives.
The battery state of charge indicator is mentioned often by owners as a practical feature, because it lets you plan a swap instead of discovering a flat pack halfway through a dense patch.
When 13 inches and 6.4 pounds is the right balance
This is the combination that suits medium to large suburban yards where the weeds are knee to waist high and the operator wants to keep working for hours without fatigue. The swath covers the job and the weight keeps the session going.
Compared with the LST136 one tier up, the trade is the PowerCommand dial and the faster charger. If you want to modulate power by hand rather than by setting, step up; if you want the lightest full kit at 40V, this is the one.
Where it runs out of road
The 13-inch swath is mid-range, so very thick weed fields need overlapping passes. A single battery also means an exchange partway through large properties unless you add a pack, which is the standard upgrade owners recommend.
If your growth is consistently shoulder height or includes bramble canes, move up to a 15-inch machine with heavier line, such as the EGO ST1502SA, or to the 60V DEWALT if you already own that platform’s batteries.
When Nylon Line Is Not Enough: Trimmer vs Brush Cutter
Every machine on this list is a string trimmer, and every one of them has a hard limit that the marketing language rarely states. Nylon line cuts herbaceous growth: grass, ragweed, thistle, stinging nettle, and green bramble canes before they lignify. It will not reliably cut woody stems, saplings, or dense thicket, and asking it to is what produces the stalled, smoking machines described in owner reports across r/lawncare and r/landscaping.
The dividing line is density as much as height. A knee-high stand of dead grass is easy. A shoulder-high stand of the same grass with bramble woven through it is a different job entirely, because the head is working against stems that spring back and wrap the spool. When that happens repeatedly, more power on the same head will not fix it.
A brush cutter is the next tool up. It runs a metal blade, a saw blade, or a nylon blade head on the same shaft and drive system, which means it handles woody material a string trimmer cannot touch. The trade is weight, noise, and a narrower safe cutting window because the blade throws debris in every direction.
Beyond that sits the walk-behind string trimmer mower, which owners on texags.com recommend by name for genuinely tall and thick growth, and which the retailer listings for this query back up with several brands in the category. It covers ground far faster than any handheld because the cutting height can be set above the standing growth and lowered as you go.
Our rule of thumb: if the growth is above head height, if the stems snap rather than bend, or if you are covering more than an acre, stop buying trimmer upgrades and look at a brush cutter or a walk-behind mower. Both are different tools with different safety profiles, not bigger string trimmers.
Choosing Trimmer Line for Heavy Weeds
Trimmer line is where tall-weed capability is quietly decided. Owners on lawnsite.com separate the tool from the head for good reason, because a machine with a mediocre head and thin line will disappoint no matter what the spec sheet says.
Line gauge is the diameter, written as .065, .080, .095, or .105 inch, and it is the single most consequential number on a heavy job. Light duty .060 to .085 inch line suits lawn and borders. Intermediate .080 to .095 handles knee to waist height grass. For dense growth above waist height you want .095 inch or heavier, which means buying line in a different gauge than the spool that came with the machine.
Shape is the second variable. Round line is the cheapest and most widely available. Square line has edges that shear stems on contact instead of wrapping around them, which is why it performs noticeably better in thick weeds at the same diameter. Braided and knifeless line uses internal filaments or metal inserts for the toughest woody growth, and it costs more and throws fragments with more force.
Third, the head has to match. A fixed spool with a thin line winding design cannot deliver what a bump-feed or automatic-feed head does, and the automatic feed systems on several picks here exist precisely because line wears fast in thick growth. Heavier line also needs a heavier head and enough motor torque to keep it spinning, which is why line upgrades and power upgrades go together rather than separately.
One practical warning from owner reports: string jams in fixed-spool heads under heavy load. If you are running .095 or heavier line, a bump or automatic feed head is worth the money.
Battery Platform Compared for Heavy-Duty Work
All ten machines here are cordless, and that choice shapes the tall-weed experience more than any other spec. Here is how the three voltage classes in this roundup behave on dense growth.
Twenty-volt machines such as the WORX WG163 and the BLACK+DECKER LST300 are efficient and light, but they pair small packs with modest torque. They are honest maintenance tools and poor tall-weed tools, and no amount of battery capacity changes that.
Forty-volt is the sweet spot for most people and holds seven of the picks here. The BLACK+DECKER LST136, the EGO ST1623T, the EGO ST1502SA, the RYOBI RY40250, the WORX WG183, the Greenworks combo, and the LST140C all sit here, and the class delivers enough torque for waist-high grass when paired with .095-inch line.
Sixty volts, represented here by the DEWALT DCST970B, is the high-torque end. Owners report it cutting inch-diameter blackberries, which no other battery machine in this roundup claims in its reviews.
Thermal behaviour is the failure mode to watch across every class. Owners report hot motors and clogged cooling screens when a head is buried in dense growth, and the pattern is consistent: the tool is fine until it is asked to cut more material than it can accelerate through. Working in passes from the top down is the practical fix, and clearing the intake screens on the DEWALT specifically is part of owning it.
Finally, platform economics. A second battery on a 40V platform often costs less than a year of fuel and it removes the only real complaint owners have about battery trimmers, which is the mid-job swap. Model choices here are partly battery choices, and that should be a deliberate part of the decision.
How to Cut Down Tall Weeds Safely
The technique matters as much as the machine, and it is the part most roundups skip. Owners who report success on heavy growth are almost always working in passes rather than attacking the base in one go.
Put on eye protection, hearing protection, gloves, and sturdy boots before the engine or trigger is touched.
If the growth is above head height or the stems snap when you bend them, use a brush cutter or walk-behind mower instead of a string trimmer.
Cut from the top down in several passes, starting at shoulder height and working toward the base as the stems shorten.
Keep the head moving. Holding it still inside the growth is what buries the spool and kills speed.
Sweep the head at a slight downward angle so the tip of the line meets the stems first rather than driving the spool straight in.
Keep the non-cutting side of the head pointed toward yourself and away from bystanders, pets, and other people working on nearby slopes.
Never raise the cutting head above waist height. Tall growth is cut low and progressively, not high and swept.
Work dry ground where possible, and stop and rake or blow away clippings between passes so the next pass is not cutting last week’s mat.
Two safety details are worth repeating because they cause most accidents. Never cut toward yourself or from the top of a slope, and keep clear of tree bark and wooden edging, since line cutting sideways into bark kills the line and can throw fragments at high speed.
Buying Guide: What Matters Most for Tall Weed Clearing
Swath width is the first filter. Think in classes: 7 to 13 inches is light duty for lawns and borders, 14 to 16 inches is intermediate and handles knee to waist height growth, and 17 inches and above is heavy duty territory that few residential trimmers reach. For tall weeds, stay at 13 inches of swath and up, and aim for 15 where the growth is shoulder high.
Line gauge is the second filter. .060 to .085 inch suits light work, .080 to .095 covers intermediate, and .095 inch or heavier is the range you want for tall dense weeds. Remember that heavier line needs a matching head and enough torque to keep it spinning.
Power class is the third. Gas remains the option with unlimited runtime and no thermal ceiling, and owners on professional forums reach for it by name for sustained whole-property work. Within cordless, 40V is the balanced choice and 60V is the torque choice, while 20V is a maintenance class.
Shaft and handle geometry is the fourth, and tall operators search on it as much as on cutting power. A straight shaft with a telescoping section suits tall operators, because it puts the head at the correct height without bending at the waist. Curved shafts are compact and lighter but harder to reach into low growth. Loop handles, also called escalator handles, give you a second grip and are the standard choice for brush because they let you push into the growth and control kickback, though none of the machines in this roundup include one. The same fit-first logic runs through our picks of big and tall office chairs, where fit for a taller frame is the deciding factor as well.
Feed system is the fifth. Bump feed is the standard and needs an interruption each time line runs out. Automatic and self-sensing feeds keep the cut continuous, which on thick growth is a genuine advantage because line wears quickly there. Variable speed triggers let you match output to density instead of running flat out.
Finally, maintenance by power type. Cordless machines need almost nothing beyond clearing clippings from the head and cooling screens, and storing packs away from extremes. The cost is battery capacity and platform lock-in, so buy the second pack with the tool rather than later.
Frequently Asked Questions
What is the best string trimmer line for heavy weeds?
For weeds above knee height, .095-inch round nylon line is the safest all-rounder, and .105-inch square line cuts cleaner because its edges shear stems instead of wrapping around them. Braided or knifeless line handles thicker woody growth but costs more and throws fragments harder. Match the line to the head, and use a model with a bump or automatic feed so you are not winding line during the job.
What is the best way to cut down tall weeds?
Cut from the top down in several passes rather than attacking the base in one. Start at shoulder height and work downward, keep the head moving, and sweep it at a slight downward angle so the tip meets the stems first. The thinner the growth as you descend, the less the motor has to push through at once, which is what causes stalling and overheating.
Can you cut weeds with a string trimmer?
Yes, for herbaceous weeds: grass, ragweed, thistle, and green brambles up to the height your power class supports. Nylon line will not cut woody stems, saplings, or thicket. One important detail: a string trimmer cuts foliage, it does not kill the plant, so control depends on cutting the growth back repeatedly before the roots exhaust their reserves.
How tall of weeds can a string trimmer cut?
A 12-inch household trimmer handles knee-high grass and weeds comfortably. A 13-to-16-inch swath running .095-inch line on a brushless motor, which is what most of the picks in this roundup offer, is the practical range for shoulder-high growth. Above head height, or where stems are woody, a brush cutter or walk-behind string trimmer mower is the realistic tool.
Why does my string trimmer stall in tall grass?
The head is buried in more material than the motor can accelerate, so speed drops to nothing and cooling airflow stops with it. Common causes are thin line gauge, a low capacity battery, a spool wound the wrong direction, or a clogged cooling screen. Work in passes from the top down, keep the head moving, use heavier line, and clear the intake screens every few minutes on long jobs.
Is a brush cutter better than a string trimmer for tall weeds?
Yes, once the growth is woody, thicker than roughly half an inch, or taller than the machine can sweep without loading up. A brush cutter uses a metal blade or nylon blade head that handles stems, saplings, and bramble thickets a string trimmer cannot. For very tall dense stands on a large property, a walk-behind string trimmer mower covers more ground per hour than either one.
Which String Trimmer Is Right for You?
The best string trimmers for tall weeds in 2026 come down to two numbers: swath width and line gauge. Our overall pick is the BLACK+DECKER 40V MAX LST136, because 13 inches at 8500 rpm with a dial that shifts power into the string is the most reliable all-round answer to dense growth without a 12-pound frame or a bare-tool purchase.
Buy the EGO POWER+ ST1623T if you want the widest swath in this roundup and 60 minutes per charge, the EGO ST1502SA if you want heavy .095-inch line already fitted, and the DEWALT DCST970B if you already run 60V MAX packs and handle green bramble canes as routine work. For light duty and small yards, the WORX WG163 and the BLACK+DECKER LST300 remain the proven value options.
And if the growth is above head height or woody rather than green, stop shopping for trimmers and look at a brush cutter or a walk-behind mower. No amount of battery voltage closes that gap.