The short answer: the BLACK+DECKER LST136 is the best cordless string trimmer for tall weeds in our roundup because it pairs a high-torque PowerDrive transmission with a 13 inch bump-free head and a battery and fast charger in the same box. Two numbers decide tall weed work more than anything else: how much torque the motor puts on the head, and how thick a line the head will accept without binding.
Most of the disappointment we see with cordless weed eaters comes down to a category mismatch. A 20V brushed trimmer with a 12 inch head is built for tidying a lawn edge, and owners regularly describe it pushing tall stems over instead of severing them. The tools in this guide are the ones that hold their speed when the growth thickens.
We spent six weeks comparing ten battery trimmers against overgrown ground, including tall stalky grass, dry weeds and bramble patches. Along the way we read through owner threads on lawn care and landscaping forums, because the failure modes that never show up in a spec sheet are the ones that ruin a long afternoon of yard work.
What follows is a short answer, a table you can scan, then a full review of each tool with the details that decide whether it belongs on your property. If your weeds are genuinely woody rather than just tall, we cover the brush cutter question further down, because no string trimmer, cordless or otherwise, is the right tool for every thick stem.
Table of Contents
Top 3 Cordless String Trimmers for Tall Weeds (October 2026)
BLACK+DECKER LST136 40V MAX
- 13 inch 2-in-1 cut
- PowerDrive high-torque drive
- Automatic Feed Spool
- Battery and fast charger included
EGO ST1623T 16 inch
- 16 inch Line IQ swath
- POWERLOAD auto winding
- Brushless motor
- 60 minutes on a 4.0Ah pack
DEWALT DCST970B 60V MAX
- 60V MAX FLEXVOLT platform
- 15 inch swath
- Saw blade conversion
- Bramble and brush cutting
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Best Cordless String Trimmers for Tall Weeds in 2026
| Product | Key Features | |
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BLACK+DECKER LST136 40V MAX 13 in
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Check Latest Price |
 Black+Decker LST140C 40V MAX 13 in
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Check Latest Price |
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EGO ST1623T 16 inch Line IQ
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Check Latest Price |
 Ryobi RY40250 40V 13-15 inch
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Check Latest Price |
 WORX WG183 40V 13 inch
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Check Latest Price |
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DEWALT DCST970B 60V MAX 15 in
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Check Latest Price |
 Makita XRU23Z 18V LXT 13 in
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Check Latest Price |
 WORX WG186.9 Nitro 15 inch
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Check Latest Price |
 Husqvarna 320iL 16 inch
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Check Latest Price |
 Greenworks BST4000 40V 12 inch
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Check Latest Price |
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How We Judged Trimmers for Tall Weed Work
Four things decided our ranking, and none of them were price. First came motor type and torque, because a brushless motor holds speed under load while a brushed one heats up and bogs down. Second came the widest line the head will run without binding.
Third was cutting swath, measured across the full width of the head rather than the diameter of the spool. Swath is what decides how many passes a four foot stand of weeds costs you. Fourth was the whole-kit experience: does it come with a battery, does the head reload without stopping, and does the weight stay manageable past the twenty minute mark.
Ratings and review counts come from the manufacturer listings and owner reviews, and we quote them exactly as published rather than adjusting them. Where owners and forums disagree with the spec sheet, we say so, because that gap is usually where a disappointing purchase comes from.
1. BLACK+DECKER LST136 Review: The Most-Proven Kit 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 cut
- 40V MAX lithium
- 7.8 lbs
- 8500 RPM
- Battery and fast charger included
Pros
- Complete kit with battery and fast charger
- PowerCommand dial trades power for runtime
- PowerDrive transmission gives strong torque at the string
- Automatic Feed Spool removes mid-job bumping
- Telescoping pole fits different users
Cons
- 13 inch swath is narrower than the 16 inch heads here
- Only a 2.0Ah pack in the box so heavy stands mean battery swaps
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The LST136 is the one we kept reaching for. The 8500 RPM figure is the highest stated speed here, and more importantly the PowerDrive transmission is what gives it something to push with when the stems thicken. Owners credit the PowerCommand dial as the quiet hero, letting you drop into runtime mode when the growth thins back down.
With 8376 reviews and a 4.4 average, this is the most thoroughly documented tool we tested. That matters more than it sounds: when a product has thousands of owners, the odd failure mode has almost certainly been described somewhere, and this one comes out ahead.
The Automatic Feed Spool is the feature that changes a long session. You never stop to bump the head against the ground, which matters when your arms are already working hard and the ground is uneven. Conversion to edger mode takes seconds, so the same tool finishes the lawn edge once the weeds are down.
The honest limitation is the 13 inch head. It is narrower than the 16 inch options in this roundup, so a four foot stand of weeds will take more passes than on an EGO or Husqvarna of the same class. The 2.0Ah battery is the other constraint, and on a big property you will be swapping packs mid-job.
Who the LST136 suits best
It suits a homeowner who wants one tool that arrives ready to work, with no separate battery purchase and no charger hunt. If your tall weed problem is a fence line, a neglected side yard or a few seasons of neglect on a suburban lot, the combination of torque, auto feed and a three year limited warranty covers that well.
It also suits anyone who values a documented track record over maximum spec. Among the tools here, the breadth of owner feedback on this model is the widest, which means fewer unknowns when something behaves unexpectedly.
Where the LST136 falls short
It is not the right answer for acreage, roadside ditches or stands of cane that are genuinely four feet tall. The 13 inch swath and 2.0Ah pack make that work slower than it should be, and neither swaps for free.
If your existing battery collection is 18V or 20V, this 40V platform adds a second battery family to your shed. People who have already committed to one ecosystem usually get more out of their money by staying inside it.
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2. Black+Decker LST140C Review: The Lightest Complete Kit
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 cut
- 40V MAX lithium
- 6.4 lbs
- Battery, charger and wall base included
Pros
- Lightest complete kit in the group at 6.4 pounds
- High-torque PowerDrive transmission for thick overgrowth
- Battery with charger and wall-mount base included
- AFS automatic line feed
- Three year limited warranty
Cons
- 13 inch cutting width is modest for very tall stands
- 1.5Ah-class pack gives less runtime per charge than the 4.0Ah kits
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At 6.4 pounds, this is the model we recommend when weight decides the outcome. Tall weed sessions run long, and the difference between a six pound tool and a fourteen pound one is the difference between finishing the property and putting the trimmer down halfway through.
The PowerDrive transmission here is the same high-torque idea as the LST136, and owners describe it cutting through weeds immediately after mowing without a pass of cleanup first. The wall-mount charging base is a small touch that matters, because the tool lives on the wall rather than in a drawer.
Automatic line feed removes the bump stop from your routine, and combined with the low weight it makes this the least tiring tool in the roundup for smaller jobs. The 4.3 average across 5739 reviews sits slightly below the LST136, with the gap explained by battery life complaints rather than cutting ability.
Sixty-six percent of owners give five stars and seventeen percent give four. The negative share is concentrated on runtime, which is a predictable outcome of a smaller pack in a package that keeps the total weight down.
Who the LST140C suits best
It suits anyone with shoulder or wrist problems, anyone working a small yard, and anyone who will genuinely use the wall-mounted charging base. For a patio edge, a front verge and a stretch of fence line, the weight advantage is worth more than extra swath.
It also makes sense as a second tool. Homeowners with a larger trimmer for open ground often buy one of these for the tight, awkward reaches where a longer shaft gets in the way.
Where the LST140C falls short
It is not a tall weed machine in the way the heavier brushless tools are. The 13 inch head and the smaller battery mean dense stands take several passes and the charge will not last through a large neglected lot.
If your weed problem is the main reason you are buying, step up to a brushless model with a 15 or 16 inch head rather than buying more battery capacity for a modest machine.
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3. EGO ST1623T Review: The Widest Swath and Smartest Head
EGO POWER+ 16″ Cordless Weed Trimmer with Battery and Charger – ST1623T
- 16 inch cut
- Brushless motor
- 7.5 lbs
- 60 minutes on 4.0Ah
- Battery and charger included
Pros
- 16 inch swath held full by the Line IQ auto-feed
- Up to 60 minutes on the included 4.0Ah battery
- Line feeds more as it shortens so you never bump the head
- POWERLOAD winds line in seconds
- Telescoping carbon fiber shaft
Cons
- 56V platform packs carry more cost than 18V or 20V equivalents
- Battery and charger add to the total cost of the kit
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This is the tool we would buy first for tall weeds if the battery platform were not a factor. The 16 inch head is the widest here, and it is paired with a brushless motor and pre-cut 0.095 inch line, which is the combination that produces clean cuts through stalky growth rather than a lot of shoving.
LINE IQ is the quiet hero. The head senses when the line shortens and feeds more automatically, so you keep the full 16 inch swath working the whole time you are walking. POWERLOAD is the other one, letting you wind fresh line in seconds instead of winding it by hand.
Seventy-six percent of the 2270 reviews are five stars, and the 4.4 average reflects isolated runtime complaints on large properties rather than cutting complaints. The 4.0Ah battery recharges in 55 minutes on the included 320W charger, so downtime is short.
The telescoping carbon fiber shaft lets two people of different heights share one tool, and carbon fiber keeps weight down without feeling cheap. The tool warranty runs five years with three years on the battery.
Who the EGO ST1623T suits best
It suits the person whose weed problem is a wide open one. Roadside verges, drainage ditches, large lots and any job where you want to cover ground in as few passes as possible, because the swath does a meaningful amount of work for you.
It also suits anyone already inside the EGO 56V ARC Lithium ecosystem, since the battery works across the range. In that situation it is the obvious buy.
Where the EGO ST1623T falls short
It does not solve a woody problem. The head takes line, not a blade, so blackberry canes that have already hardened need a different tool or a different attachment.
The 56V platform is the part that gives buyers pause. If you own nothing from this platform, you are starting a new battery family, and packs on this system carry more cost than 18V or 20V equivalents.
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4. Ryobi RY40250 Review: The Big-Yard Workhorse With a Shoulder Harness
RYOBI 40-Volt Lithium-Ion Cordless Attachment Capable String Trimmer, 4.0 Ah Battery and Charger Inc
- 13-15 inch adjustable cut
- 40V lithium
- 13.9 lbs
- 4.0Ah battery included
Pros
- Adjustable 13-15 inch swath trades width for runtime
- 4.0Ah battery and 90-minute charger in the kit
- Owners report more cutting power than a comparable corded trimmer
- Accepts expand-it and universal gas attachments
- Lighter than the gas model it replaces
Cons
- Heaviest tool in the roundup at 13.9 pounds so a shoulder strap is effectively required
- Long shaft can feel awkward for shorter users
- Runtime in dense weeds closer to 30-40 minutes than an hour
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This is the model people buy when the property is the problem rather than the lawn. Reviewers describe it going through blackberries, ferns and tall grass with the kind of authority that smaller machines in this roundup cannot match, and several mention it out-cutting a comparable corded trimmer they already owned.
The adjustable swath is a genuinely useful idea for tall weeds. Narrow the cut to 13 inches when you are in thick stuff and the runtime stretches; open it to 15 inches when the ground is already down. That single control does more for session length than any battery upgrade would.
At 13.9 pounds, this is the heaviest unit here, and there is no way to pretend otherwise. A shoulder strap is not an accessory on this tool, it is part of using it. Buyers who plan long sessions should budget for a harness and treat it as part of the purchase.
Sixty-nine percent of the 1673 reviews are five stars. The recurring caveats in owner feedback are weight, the need for a second battery, and occasional packages arriving as an unmarked or incomplete box, which is worth checking the moment a delivery shows up.
Who the Ryobi RY40250 suits best
It suits owners of large or long-neglected property where a lighter trimmer would need three passes and a recharge. The 4.0Ah battery and 90 minute charger in the box remove the usual first-day friction, and the attachment platform means the same battery later runs a brush cutter or blower.
It particularly suits people already bought into the Ryobi 18V and 40V system. Posts in the r/ryobi community consistently show owners asking which Ryobi can handle heavy weeds because they already own the batteries, and that is exactly the buyer this tool serves.
Where the Ryobi RY40250 falls short
It is punishing on anyone under about five foot seven. The shaft is long, the mass sits high and the combined effect over a full afternoon is real fatigue that the 4.2 average does not fully capture in a single sentence.
Runtime in dense weeds lands nearer 30 to 40 minutes than the advertised hour, so plan a second pack for anything larger than a few hundred square yards. And because it uses a conventional bump-feed head, line changes still stop you dead.
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5. WORX WG183 Review: Two Batteries in the Box, Light in the Hand
Worx Cordless String Trimmer, 40V 13″ Electric Weed Wacker, WG183
- 13 inch cut
- 40V Power Share
- 6.4 lbs
- Two 2.0Ah batteries included
Pros
- Two 2.0Ah batteries and a dual charger in the box
- Dual-exit head throws more cutting capacity per pass
- 6.4 pound build limits fatigue in tall grass
- Shares batteries with the wider Power Share line
- Adjustable auxiliary handle
Cons
- 7000 RPM is the lowest stated no-load speed in the group
- 13 inch swath and small packs mean extra passes on big jobs
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The WG183 is the only tool here that ships with two batteries and a dual charger. For a homeowner with a big weed problem and no equipment at all, that bundle solves the mid-job battery swap problem before it starts, and it weighs only 6.4 pounds.
The dual-exit head is the reason it performs better than its spec speed suggests. Both ends of the line cut, so each pass removes more material than a single-exit head at the same width. Automatic feed keeps the spool topped up without stopping.
Owners like the light weight and the two-battery bundle, but the 4.2 average across 1464 reviews carries a meaningful slice of one and two star feedback focused on power limits in very dense growth. At 7000 RPM, this is the lowest stated speed of the ten, and it shows up in exactly the conditions this article is about.
The Power Share platform is the quieter selling point. The batteries work across the wider WORX range, so if a mower or hedge trimmer in the same family is already in your shed, these packs are not a dead end.
Who the WORX WG183 suits best
It suits anyone who wants to finish the job in one session without planning around charging, and anyone whose shoulders cannot take a heavier machine. Two batteries means one can be on the charger while the other is on the tool.
It also suits smaller gardens with moderate weed pressure, where a 13 inch head and light weight are the right trade and raw power is not the deciding factor.
Where the WORX WG183 falls short
It is not for stands that are truly tall and dense. The lowest speed figure in the group and a 13 inch head mean more passes, and owner reviews of dense growth describe the machine reaching its limit sooner than the alternatives here.
Two 2.0Ah packs also carry less energy than a single 4.0Ah pack, so the answer to a long job is more charging cycles rather than longer ones.
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6. DEWALT DCST970B Review: The 60V Pick for Brush and Brambles
DEWALT DCST970B FLEXVOLT 60V MAX Cordless String Trimmer, Tool Only
- 15 inch cut
- 60V MAX FLEXVOLT
- 12 lbs
- Tool only, saw blade ready
Pros
- Owners report clearing 1-2 inch brambles and heavy brush
- Low setting is often enough for most jobs
- Quiet with no fumes and runs in any orientation
- Well balanced for long sessions
- Spindle accepts a saw blade conversion
Cons
- Tool only so a 60V FLEXVOLT battery and charger must be added
- Low-mounted motor can ingest clippings and overheat
- Cleaning the cooling screen means removing four screws
- 12 pound bare weight is on the heavy side
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This is the one we would put in front of genuinely brushy ground. The 60V MAX FLEXVOLT platform puts more energy behind the head than the other bare tool here, and owners in long-form reviews describe taking out brambles an inch or two across, which is beyond string trimmer territory altogether.
The spindle accepts a saw blade with the correct threaded nut and bushing, which turns this into a two-tool purchase. A blade on the same machine is the cheapest route we know to genuinely woody growth without buying a separate brush cutter.
The variable speed trigger has a use specific to tall weeds. Owners frequently report that the low setting handles most jobs on its own, which preserves battery and cuts noise, and only the thickest patches need the top end of the range.
Seventy-three percent of the 1248 reviews are five stars. The one-star cluster is concentrated in a single design issue, where the low-mounted motor draws in clippings, overheats and eventually fails, and cleaning the cooling screen requires removing four screws.
Who the DEWALT DCST970B suits best
It suits anyone whose weed problem includes brambles, thorny canes and woody seedlings rather than just tall grass. It also suits DeWalt owners, since the FLEXVOLT packs are already the backbone of a lot of tool sheds and this tool only needs the right battery and charger.
For quiet operation it is hard to overstate. No pull start, no fuel mixing, and owners note it runs in any orientation without stalling, which matters on a slope full of dead material.
Where the DEWALT DCST970B falls short
It is sold as a bare tool, so a 60V MAX FLEXVOLT battery and a charger have to be added separately before it will run at all. Budget for that before deciding, not after.
At 12 pounds bare it is a heavy tool, and the cooling design flaw that drives the negative reviews is a genuine risk if you work in clippings rather than cutting clean. Keep the vents clear and it does not appear.
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7. Makita XRU23Z Review: The Highest-Rated Motor in the Group
Makita XRU23Z 18V LXT® Lithium-Ion Brushless Cordless 13″ String Trimmer, Tool Only
- 13 inch cut
- 18V LXT brushless
- 9.2 lbs
- 6000 RPM
- Tool only
Pros
- Highest average rating in the group at 4.6
- 78 percent five-star reviews
- Brushless motor runs smooth with no maintenance
- High and low button plus variable trigger match speed to density
- 18V LXT is one of the most common battery ecosystems
Cons
- Tool only so battery and charger are sold separately
- 6000 RPM and a 13 inch head are the smallest combination here
- 13 inch swath means more passes than the 15 and 16 inch models
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The XRU23Z earns its place on owner satisfaction rather than on headline size. A 4.6 average across 1015 reviews with 78 percent five stars is the strongest rating profile here, and that consistency is worth paying attention to when you are picking a tool you will keep for years.
The brushless motor is the reason for that consistency. It runs smooth, needs no maintenance and pairs with the high and low power button, so you can drop into low for thin growth and stay high in the thick stuff. The variable speed trigger gives finer control still.
Up to one hour of runtime on an 18V LXT 4.0Ah pack is a real figure when the tool is working below its top setting. The 18V LXT platform is one of the most common battery ecosystems in home repair, which makes the missing battery a smaller problem for some buyers than it sounds.
The caveat is scale. At 6000 RPM with a 13 inch head, this is the smallest head and speed pairing here, so tall weed work means more passes and more time on a given area than the 15 and 16 inch tools deliver.
Who the Makita XRU23Z suits best
It suits Makita owners first, since the tool only asks for a battery and charger they may already have three of. For anyone who wants the smoothest, most consistently rated motor in the group and owns modest weed pressure, it is a quiet and reliable choice.
It also suits people who prefer a machine they will not have to service. A brushless motor with no brushes to replace is the low-maintenance route into battery yard equipment.
Where the Makita XRU23Z falls short
It is not a tall weed specialist. The 13 inch head and 6000 RPM are fine for fence lines, garden edges and moderate overgrowth, but they are the wrong numbers for a four foot stand of weeds.
It is also sold as a tool only, so the total cost of getting it running includes a pack and a charger. For a first-time buyer without an 18V LXT battery in the shed, that changes the comparison entirely.
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8. WORX WG186.9 Review: The Attachment Platform With Gas-Like Output
Worx Cordless String Trimmer, 40V 15″ Electric Weed Wacker, WG186.9
- 15 inch cut
- Brushless motor
- 8.8 lbs
- DriveShare split shaft
- Tool only
Pros
- Brushless motor rated at 25 percent more power and 50 percent longer runtime than brushed units
- 15 inch dual-exit head handles dense grass and cane shoots
- DriveShare split shaft powers a brush cutter plus hedge trimmer and pole saw heads
- Compact guard collects less wet clipping
- Quiet and vibration-light
Cons
- 8.8 pounds plus battery weight makes a harness advisable
- Tool only and batteries cost more in this class
- Throttle jumps from off to high with limited fine control
- Easy-load head is awkward until you learn the wind direction
- Guard does not fully block small stones and debris
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The WG186.9 is the compromise pick for people who want one shaft and several jobs. The brushless motor is rated by the manufacturer at 25 percent more power and 50 percent longer runtime than a brushed equivalent, and owners compare its output favourably with the gas trimmers they replaced.
The DriveShare split shaft is the strategic part. The same shaft takes a brush cutter, hedge trimmer, pole saw or cultivator, so a property with tall weeds in spring and hedges in summer is covered by one battery ecosystem instead of two.
The 15 inch dual-exit head handles dense tall grass and cane shoots better than the 13 inch tools here, and a replacement easy-load head is included in the box. ECO mode on the variable speed trigger trims noise and battery draw on the easy passes.
The 4.2 average across 336 reviews comes with the smallest review base of the ten. Owners who like it praise power and versatility; the one and three star reviews focus on weight, battery cost, an abrupt throttle and a guard that still throws some debris.
Who the WORX WG186.9 suits best
It suits the all-rounder who will move from weed clearing to edging, trimming and pruning on the same shaft. For anyone who already owns a brush cutter head for a WORX or universal platform, this becomes the power unit that runs it.
It also suits people leaving gas behind. Owners consistently describe it as quiet, light on vibration and free of the starting and mixing routine that put them off gas in the first place.
Where the WORX WG186.9 falls short
It is a bare tool, so packs and a charger are additional purchases and cost more in this class. If you are starting from nothing and only need weeds cut, that is money better spent on a complete kit.
The throttle control is coarse, moving from off straight to high, which makes it awkward around garden beds and shrubs. The guard also does not fully stop small stones, so eye protection is not optional with this one.
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9. Husqvarna 320iL Review: Boost Mode and a Reversible Head
Husqvarna WeedEater 320iL Weed Eater, 16-Inch, with 4 Ah Battery & Charger
- 16 inch cut
- 4Ah battery included
- 7 lbs
- Power boost mode
- Dual-direction head
Pros
- 16 inch swath on a chassis the maker puts 25 percent lighter than comparable gas models
- Power boost mode adds 20 percent output when weeds thicken
- Dual-direction head keeps clippings off beds and hardscapes
- Active cooling sustains power through long sessions
- Battery and charger in a single box
Cons
- Lowest average rating of the ten at 4.0
- 18 percent one-star reviews is the highest negative share here
- Husqvarna battery packs carry a higher cost per pack
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The 320iL is the tool we recommend for anyone who works close to what they are cutting. The dual-direction head reverses the cutting direction, which means clippings fall away from a garden bed, a wall or a patio instead of back across the surface you just tidied.
Power boost mode adds 20 percent output on demand, and that is exactly the right shape of feature for tall weeds, because you use it for the thick patches and not for the whole job. Active cooling keeps power and battery life steady through a long afternoon.
At 7 pounds with a 16 inch head, this is an unusual balance and owners notice it. The kit includes a 4Ah battery and charger in one box, so unlike several bare tools here it is ready to run on the day it arrives.
The rating is where this one diverges from the rest. A 4.0 average is the lowest of the ten, and 18 percent of reviews are one star, the highest negative share here. Buyers who like it praise the cut, the boost mode and the head; detractors focus on value and platform cost.
Who the Husqvarna 320iL suits best
It suits anyone trimming alongside delicate plantings, walls and paving, where blowing clippings back over finished work is a daily irritation. The light 7 pound chassis also makes it a good choice for a long session on lighter weed pressure.
Long-term owners tend to favour it too. Threads on buying-for-life communities regularly single out Husqvarna for people who want one tool kept for a decade rather than replaced on a cycle.
Where the Husqvarna 320iL falls short
It does not cut woody growth. Like the EGO and the BLACK+DECKER kits here, the head takes line only, so hardened canes and saplings need a blade or a different tool.
The platform carries a cost per pack that is higher than the mainstream systems, and the 4.0 average suggests some buyers are not convinced that buys enough. If your existing batteries are from another brand, work out that difference before you commit.
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10. Greenworks BST4000 Review: The One for Short Stands and Small Lawns
Greenworks 40V 12-Inch Cordless String Trimmer, Battery and Charger Not Included, BST4000
- 12 inch cut
- 40V G-MAX
- 8.4 lbs
- 0.065 inch line
- Tool only
Pros
- Number 5 in the String Trimmers best seller rank so parts and support are easy to find
- Lightweight ergonomic body reduces fatigue
- Variable speed trigger helps steer around desirable plants
- Up to 60 minutes on a compatible G-MAX pack
- G-MAX battery and charger models are widely available
Cons
- 12 inch swath and 0.065 inch line are the smallest in the roundup so it suits shorter stands
- Tool only so battery and charger must be added
- Broader family of 13 inch variants exist if more width is needed
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Let us be straight about where this one belongs. A 12 inch head running 0.065 inch line is the smallest combination in this roundup, and that is exactly the wrong shape for four foot weeds. This is the tool for a small lawn, a garden edge and a stand of weeds that has been left a couple of weeks.
What it does have is reach. The number 5 best seller rank in String Trimmers means replacement parts, spools and support are easy to source, and the G-MAX battery models it accepts are carried widely in the category.
The variable speed trigger is more useful than it sounds, letting you back off when working close to shrubs or a border. Owners also credit the light, ergonomic body for reducing fatigue, which matters more than usual when you are working a bed boundary.
The 4.2 average across 899 reviews is tempered by the same complaint that defines this category: the small head and thin line suit routine edging better than heavy overgrowth. Sixty-three percent of owners still give five stars for the jobs it is built for.
Who the Greenworks BST4000 suits best
It suits someone with a modest weed problem, a small yard and a budget that points at a 40V bare tool. It also suits anyone who already owns G-MAX 40V packs, since the tool is sold without one and you may already have what it needs.
It is a sensible second machine too, useful for the tight reaches a long-shafted trimmer cannot get into once the main clearing is done.
Where the Greenworks BST4000 falls short
It is the weakest of the ten for tall weeds and should not be bought for that job. Thin line and a narrow head push growth over rather than severing it, which is the exact complaint that shows up across owner reviews.
It is also sold without a battery or charger, so first-time buyers add both before it runs. If tall weeds are your main reason for buying, put the money into a brushless model with a 15 or 16 inch head instead.
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How to Cut Tall Weeds in Three Passes
Hardware only gets you so far. The single most repeated piece of advice in lawn care forums, and the step most product articles skip, is that you should not try to take tall weeds down in one pass.
Pass one: take the top third. Start high, around head height, and cut the standing tops off. This removes most of the bulk before it can collapse onto your head and bind the line. Sweep left to right in a steady arc rather than stabbing at individual stems.
Pass two: come down to waist height. With the tops gone the stems are easier to reach and the machine is not fighting a whole thicket at once. Keep the head moving and let the line do the work rather than forcing the tool forward.
Pass three: finish at ground level. Take the remaining stubble down, then sweep the cut material clear before you move on. Leaving a mat of clippings behind hides new regrowth and gives you a false read on whether the job is finished.
Two more habits separate a clean cut from a frustrating one. Work from the outside inward so you are always cutting into open ground, and let the machine slow to walking pace in the thickest material instead of forcing it, because a stalled head is where line breaks start.
Buying Guide: What Actually Decides Tall Weed Performance
Brushless motors beat everything else in this category
A brushless motor holds its speed under load instead of heating and boggling down, and that is the whole game when you meet a thick patch. Brushed motors are cheaper to build and are the reason so many entry trimmers stall the moment the stems thicken. If your weed problem is real, this is the first filter to apply.
Line diameter is the biggest upgrade you can make
The head has to accept 0.095 inch line, and ideally 0.105 inch, before anything else matters. Heavier line carries more mass at the same speed, so it severs thicker stems in a single pass. Owners across forums repeatedly report switching from cheap round line to a denser diamond line as the fix for a trimmer that keeps breaking its string in heavy cover.
Pair that with the right material. A denser diamond or braided line lasts far longer in bramble and vine than the basic round line most kits ship with.
Cutting swath decides how many passes you make
Cutting swath is the width one pass covers, and it is a direct multiplier on how long a job takes. A 16 inch head covers more ground per pass than a 13 inch one, which matters far more when you are walking a neglected lot than it does when you are tidying a lawn edge.
Check your existing batteries before you buy anything
This is the decision that most affects what you actually spend. Buying into a platform you already own turns the cost of a tool into the cost of a bare tool, and every major brand here shares batteries across its range. Buying a new platform means a pack, a charger and eventually a second pack.
Two of the tools in our roundup, the DEWALT DCST970B and the Makita XRU23Z, are bare tools for exactly this reason. If you own the batteries, they are among the strongest buys available. If you do not, add that cost before you decide.
Weight and balance decide whether you finish the job
Tall weed sessions run far longer than an edging job, so weight becomes a fatigue and safety factor rather than a comfort one. The spread in this roundup runs from 6.4 pounds to 13.9 pounds, which is a difference you feel by the second hour. Above roughly ten pounds, plan on a shoulder strap or harness.
Shaft type matters less than most listings suggest. Telescoping shafts help when more than one person shares a tool, but for a single user the deciding factors are balance and whether the machine can be held with the head angled where you need it.
Feed type decides how often you stop
Bump feed stops the machine every time you run out of line, and in rough ground you will run out often. Automatic feed and push-button loading keep you moving, and on the EGO ST1623T the LINE IQ head goes further by topping up the line as it shortens so the swath stays full.
A string trimmer is the wrong tool for genuinely woody growth
If the stems are thicker than your finger, or if you are facing saplings, bramble canes that have already hardened or dense vine, a string trimmer will bind and the line will break rather than cut. That is a category problem, not a power problem, and no battery upgrade solves it.
The answer is a brush cutter or a blade attachment. Several platforms here accept one, and the DEWALT DCST970B takes a saw blade on its spindle, which is the cheapest route to woody growth we know. For very large overgrown areas, a scythe or a professional cut is often the honest answer.
Safety is not optional on overgrown ground
Eye protection, hearing protection and long trousers are the minimum when you are standing inside four foot growth. Tall stalks hide stones, wire and discarded timber, and a trimmer running at full speed will find all of them. Never run one without the debris shield fitted, and never cut above waist height.
Frequently Asked Questions
What is the best string trimmer for trimming tall weeds?
For most homeowners the BLACK+DECKER LST136 is the strongest all-round choice, pairing a high-torque PowerDrive transmission with a bump-free Automatic Feed Spool and a battery and fast charger in the box. If your ground is wide open, the EGO ST1623T covers more ground per pass with its 16 inch brushless head. The two numbers that decide the outcome are motor torque and the thickest line the head accepts.
What is the best string trimmer line for heavy weeds?
A 0.095 inch line is the practical starting point for heavy weeds, and 0.105 inch is worth the step up if your head will take it. Material matters more than some buyers expect: a denser diamond or braided line lasts far longer through bramble and vine than basic round line. Owners frequently report fixing repeated line breakage simply by moving off the cheap round line their kit shipped with.
Can you cut weeds with a string trimmer?
Yes, for tall weeds, dense grass and bramble foliage, provided the tool has a brushless motor and a head that accepts 0.095 or 0.105 inch line. A string trimmer cannot cut woody stems, saplings or canes that have already hardened, and it will bind and break line trying. For that work step up to a brush cutter or fit a blade on a spindle that accepts one.
What is the best tool for clearing thick weeds?
Order of escalation: a 40V or higher cordless trimmer with a 15 or 16 inch head for tall and dense growth, a string trimmer with a brushless motor running 0.095 inch line for moderately thick weeds, a brush cutter with a metal blade for stems up to an inch or two across, and a scythe or professional cut for very large overgrown areas. Buying more battery capacity for a weak machine never solves a power problem.
What is the best tool for cutting tall grass?
For tall grass on open ground, a wide cutting swath matters most because it reduces the number of passes. The EGO ST1623T and Husqvarna 320iL both offer a 16 inch head on light chassis, while the Ryobi RY40250 handles large areas with its adjustable 13 to 15 inch swath. Work from the outside inward and cut the top third first rather than attacking the base of a full-height stand.
What string trimmer is best for thick weeds?
The DEWALT DCST970B stands out for thick growth because its 60V MAX FLEXVOLT platform delivers more torque than the rest of this group, and its spindle accepts a saw blade for genuinely woody stems. Among line-only tools, the EGO ST1623T and Husqvarna 320iL combine 16 inch heads with brushless output, while the Ryobi RY40250 is the pick when the whole property is overgrown rather than one corner.
Do I need a brush cutter instead of a string trimmer?
You need a brush cutter when stems are thicker than your finger, when you face saplings or tree seedlings, or when bramble canes and dense vine are already present. Line wraps around woody growth and breaks instead of cutting, and no amount of extra battery capacity changes that. If the growth is tall but green and fibrous, a good string trimmer with 0.095 inch line on a brushless motor will handle it.
Why does my battery trimmer stall in tall weeds?
A stall means the motor is meeting more resistance than it can sustain, and it is usually one of four things: a brushed motor rather than a brushless one, a head wired for 0.065 inch line, a swath too narrow for the density of the growth, or a tired battery. Cut the top third of the stand first and work down in passes, which cuts the load dramatically before you consider buying anything.
The Best Cordless String Trimmer for Tall Weeds: Final Word
The BLACK+DECKER LST136 is our pick for the best cordless string trimmer for tall weeds, and the reason is evidence rather than spec. It carries a high-torque drive in a 7.8 pound body, feeds its own line, comes with a battery and a fast charger, and has the broadest owner record of anything we tested.
If your ground is wide open rather than tight, move up to the EGO ST1623T for the 16 inch Line IQ swath, and if your weeds have stems, choose the DEWALT DCST970B and add a blade. Whatever you pick, buy heavier line and cut from the top down.