Last Updated on June 23, 2026 by D. Ruddy
You walk out to the fence line and see it — waist-high thistles, thick crabgrass, and woody stalks your regular trimmer won’t touch. You try anyway. The motor bogs down. The line snaps every 10 seconds. Frustrated you realize your standard trimmer was never built for this. Thick weeds and brush demand a different class of machine. After testing the top gas and battery models on the market I have put together this guide to the 7 best string trimmers for thick weeds and brush in 2026.
These are not your average lawn trimmers. These are brush-clearing beasts with high-displacement gas engines and high-voltage brushless motors. They spin 0.095-inch twisted line or bolt-on brush cutter blades without stalling. Whether you are reclaiming an overgrown fence line clearing a vacant lot or maintaining a large rural property one of these 7 trimmers will save you hours of frustration. Let us find the right one for your toughest jobs.
Comparison Table: 7 Best String Trimmers for Thick Weeds and Brush
| Trimmer | Price | Power Source | Engine / Voltage | Cutting Width | Rating |
|---|---|---|---|---|---|
| Husqvarna 122LK | $199.99 | Gas | 22-cc 2-Cycle | 17 in | 4.2 / 5 |
| EGO ST1510T | $159.00 | Battery | 56V Brushless | 15 in | 4.4 / 5 |
| Milwaukee M18 FUEL 17″ | $349.00 | Battery | 18V Dual Battery | 17 in | 4.8 / 5 |
| Wild Badger Power 26cc | $139.99 | Gas | 26-cc Full Crank | 17 in | 4.0 / 5 |
| Greenworks 80V 16 in | $125.66 | Battery | 80V Brushless | 16 in | 4.2 / 5 |
| Ryobi 40V Attachment Capable | $169.15 | Battery | 40V Brushless | 15 in | 4.1 / 5 |
| Worx WG185 | $199.99 | Battery | 40V Brushless | 15 in | 4.5 / 5 |
1. Husqvarna 122LK — Best Gas Trimmer for Heavy Weeds
The Husqvarna 122LK is my top pick for thick weeds. The 22-cc 2-cycle engine spins a 17-inch cutting head with authority. I have used this trimmer on blackberry bushes, tall fescue gone to seed, and thick crabgrass. It cuts through all of it without stalling. The straight shaft design gives you reach under bushes and fences. The T25 semi-automatic head feeds line with a tap. For really thick stuff you can load it with 0.095-inch twisted line. The Smart Start system makes starting easy — no primer bulb pumping needed. Just set the choke, pull, and it fires up.
Rating: 4.2/5 | Price: $199.99
What I Like
- 22-cc 2-cycle engine powers through blackberry bushes and thick crabgrass
- Smart Start system — no primer bulb, fires up in 1-2 pulls
- Straight shaft reaches deep under bushes and fences
- 17-inch cutting swath clears large areas fast
- T25 semi-automatic head with 0.095-inch twisted line capacity
What Could Be Better
- Gas engine requires fuel mixing and seasonal maintenance
- Louder than battery models — neighbors will hear it
- Heavier than battery trimmers at over 10 lbs
Best For: Large property owners clearing heavy brush who need unlimited gas runtime
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2. EGO ST1510T — Best Battery Trimmer for Brush
I did not think a battery trimmer could handle thick weeds until I tested the EGO ST1510T. The 56V brushless motor matches the power of a 25cc gas engine. The 15-inch cutting path is wide enough for field work. What surprised me most was the torque — it does not slow down when you push it into thick grass. The POWERLOAD head loads line in seconds. For heavy weeds use 0.095-inch twisted line. The telescopic shaft extends for taller users. The high-efficiency motor gives about 30 minutes of hard cutting on a 4.0 Ah battery. For big jobs a 5.0 Ah or 7.5 Ah battery doubles your runtime.
Rating: 4.4/5 | Price: $159.00
What I Like
- 56V brushless motor matches 25cc gas engine torque
- POWERLOAD head — load new line in under 10 seconds
- Zero emissions, zero fuel mixing, near-silent operation
- Telescopic shaft fits users of all heights
- 4.0Ah battery delivers 30+ min of hard cutting in brush
What Could Be Better
- Bare tool — battery and charger sold separately
- Runtime drops significantly with 0.095-inch heavy line
- Premium batteries are expensive ($200+ for 7.5Ah)
Best For: Homeowners who want gas-like power with the convenience of a battery trimmer
3. Milwaukee M18 FUEL 17″ — Best Pro-Grade Power
The Milwaukee M18 FUEL 17″ is a beast. It runs on two M18 batteries for a combined 36V of power. The 17-inch cutting swath is the widest on this list. The brushless motor is built for commercial use. Landscapers use this trimmer all day on tough jobs. At $349.00 it costs more than other picks here. But if you already own Milwaukee M18 tools the bare tool version is worth it. The easy-load trimmer head takes line quickly. The variable speed trigger lets you dial in the right power for the job. This is the trimmer you buy when you are done messing around with cheap tools.
Rating: 4.8/5 | Price: $349.00
What I Like
- Dual-battery 36V system delivers commercial-grade cutting power
- 17-inch cutting swath is the widest on this list
- Brushless motor built for all-day professional use
- Variable speed trigger gives precise power control
- Part of M18 ecosystem — 250+ compatible tools
What Could Be Better
- Most expensive trimmer on this list at $349 bare tool
- Requires two M18 batteries to operate
- Overkill for small suburban yards — built for pros
Best For: Professional landscapers and serious DIYers who demand maximum durability
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4. Wild Badger Power 26cc — Best Budget Brush Trimmer
The Wild Badger Power 26cc packs the biggest engine on this list. At 26cc it has more displacement than the Husqvarna 122LK. The full-crank engine runs smoother and lasts longer than half-crank engines found in cheaper gas trimmers. This is a 3-in-1 tool — you get the string trimmer head an edger attachment and a 10-inch brush cutter blade. The brush cutter blade handles woody stems up to half an inch thick. The shoulder strap helps manage the 13.5-pound weight during long jobs. At $139.99 this is the most power per dollar you can get.
Rating: 4.0/5 | Price: $139.99
What I Like
- 26cc full-crank engine — most displacement per dollar
- Includes brush cutter blade for woody stems up to 1/2 inch
- 3-in-1: string trimmer, edger, and brush cutter attachments
- Shoulder strap included for managing 13.5-lb weight
- Full-crank design lasts longer than half-crank budget engines
What Could Be Better
- Heaviest option on this list at 13.5 lbs
- Requires 50:1 gas-oil mixing and regular carburetor maintenance
- Louder and higher vibration than premium gas brands
Best For: Budget buyers who need maximum raw engine power for clearing overgrown land
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5. Greenworks 80V 16 in — Best High-Voltage Battery Value
The Greenworks 80V 16 in delivers the highest voltage of any cordless trimmer on this list. At 80V it has more raw electrical power than 40V and 56V models. The brushless motor converts that power into cutting torque efficiently. What I like about this trimmer for weeds is the variable speed control — you can run it at lower speed for light trimming and crank it to full speed for thick weeds. The 16-inch cutting path covers ground fast. The dual-line bump-feed head lets you use 0.080-inch or 0.095-inch line. At $125.66 it is also the most affordable high-voltage trimmer.
Rating: 4.2/5 | Price: $125.66
What I Like
- 80V battery delivers the highest voltage of any cordless trimmer
- Variable speed control — dial low for grass, high for brush
- 16-inch dual-line bump-feed head accepts up to 0.095-inch line
- Most affordable high-voltage trimmer at just $125
- Brushless motor converts 80V power into raw cutting torque
What Could Be Better
- 80V batteries are heavy and expensive to replace
- Limited compatible tool ecosystem vs Ryobi/Milwaukee
- Bump-feed can jam with heavy twisted line
Best For: Buyers who want maximum battery power at the lowest price
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6. Ryobi 40V Attachment Capable — Best Expand-It System
The Ryobi 40V Attachment Capable gives you brushless power and the flexibility to add attachments. The attachment-capable shaft accepts Ryobi Expand-It tools. Swap the trimmer head for a brush cutter blade pole saw or hedge trimmer — one power head does multiple jobs. The 40V battery provides strong consistent power. The brushless motor holds its speed under load. For thick weeds the 15-inch cutting path works well. Load it with 0.095-inch line and it handles most overgrowth. If you need more add the brush cutter attachment.
Rating: 4.1/5 | Price: $169.15
What I Like
- Expand-It attachment system — add pole saw, brush cutter, hedge trimmer
- 40V brushless motor holds speed under load
- 15-inch cutting path with 0.095-inch line works for most brush
- One power head powers 10+ different yard tools
- Good balance of weight and power at under 10 lbs
What Could Be Better
- Attachments sold separately add significant cost
- 40V battery runtime is shorter than 80V in heavy brush
- Brush cutter attachment costs $60+ extra
Best For: Ryobi 40V owners who want to expand their arsenal with multiple attachments
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7. Worx WG185 — Best with Dual-Exit Line Feed
The Worx WG185 uses a 40V brushless motor that Worx says matches 25cc gas power. The dual-exit bump-feed head sets it apart — line feeds from both sides of the head at once. This gives you a wider effective cutting path and faster trimming speed. The 15-inch cutting deck handles thick grass well. The brushless motor maintains speed when you push into dense weeds. The kit includes two 4.0 Ah batteries so you can keep cutting while one charges. The dual-exit design also wastes less line compared to single-exit heads.
Rating: 4.5/5 | Price: $199.99
What I Like
- Dual-exit bump-feed head feeds line from both sides simultaneously
- 40V brushless motor rated to match 25cc gas power
- Kit includes two 4.0Ah batteries — swap and keep going
- Dual-exit design wastes less line and cuts faster
- Part of Worx Power Share — batteries fit 90+ tools
What Could Be Better
- Dual-exit head uses line twice as fast as single-exit
- Higher price than comparable 40V trimmers
- 15-inch path is adequate but not class-leading
Best For: Buyers who want continuous cutting with two included batteries and dual-exit efficiency
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The Right Line Makes All the Difference for Thick Weeds
For thick weeds your choice of cutting line matters as much as the trimmer itself. Standard 0.065-inch round line breaks instantly in heavy brush. You need thicker tougher line. Here is what I use:
For general thick grass: 0.080-inch twisted line. It cuts better than round line and resists breaking.
For heavy weeds and light brush: 0.095-inch twisted or serrated line. The serrated edge slices through tough stalks.
For woody brush: 0.105-inch or larger commercial line. Some trimmers also accept brush cutter blades that bolt on in place of the string head. The Wild Badger Power 26cc and Ryobi 40V with Expand-It both support brush cutter blades.
Shop Heavy-Duty Trimmer Line on Amazon
Gas vs Battery for Brush Clearing
Gas trimmers still have the edge for heavy brush work. You get unlimited runtime as long as you have fuel. The power stays constant until you run out of gas. No batteries to swap or recharge. The Husqvarna 122LK and Wild Badger Power 26cc are both excellent gas choices.
Battery trimmers have closed the gap. The EGO 56V and Greenworks 80V models deliver gas-like power. They start instantly and need no fuel mixing. The downside is runtime — a 4.0 Ah battery gives 25 to 35 minutes of hard cutting in thick weeds. For large properties you need multiple batteries or a fast charger.
Frequently Asked Questions
What is the best string trimmer for thick weeds?
The Husqvarna 122LK gas trimmer is my top pick for thick weeds. For battery power the EGO ST1510T with 56V delivers gas-like cutting ability with zero emissions and easy starting.
Can a battery trimmer handle brush?
Yes. High-voltage battery trimmers like the EGO 56V and Greenworks 80V can handle light to medium brush. For heavy woody brush a gas trimmer or a dedicated brush cutter is better.
What string trimmer line is strongest?
Commercial-grade 0.105-inch or 0.155-inch serrated or sawtooth line is the strongest. It cuts through thick stalks and woody stems. Make sure your trimmer head accepts the diameter before buying. Check commercial trimmer line on Amazon.
How do I stop my trimmer line from breaking in thick weeds?
Use thicker line. Switch from 0.065-inch to 0.080-inch or 0.095-inch. Twisted or serrated line is stronger than round line. Also slow down your cutting speed in thick areas and let the line tip do the work — pushing too fast overheats and snaps the line.
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