Last Updated on June 20, 2026 by D. Ruddy
Struggling with overgrown weeds and thick brush in your yard? A standard trimmer just won’t cut it. You need a machine built to handle heavy grass, thistles, and woody stems without bogging down. After testing the top models on the market, I’ve put together this guide to the best string trimmers for thick weeds in 2026. Whether you prefer gas power or cordless convenience, these brush-clearing beasts will save you time and frustration. Let’s find the right trimmer for your toughest jobs.
What Makes a Trimmer Good for Thick Weeds
I learned this lesson the hard way. I bought a cheap 18V trimmer for my yard. It worked fine on regular grass. Then spring came and the weeds by my fence grew waist-high. The trimmer bogged down every 10 seconds. The line snapped constantly. It took me 3 hours to do what should have taken 30 minutes.
Thick weeds and brush need three things: power, a strong feed system, and the right cutting line. A trimmer that works great on lawn grass will fail hard when you point it at overgrown thistles, tall crabgrass, or woody brush. The trimmers on this list have the motor power and build quality to handle the tough stuff.
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
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.
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.
3. Milwaukee M18 FUEL 17-inch Dual Battery Trimmer
The Milwaukee M18 FUEL 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, 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.
4. Wild Badger Power 26cc — Best Budget Brush Trimmer
The Wild Badger Power 26cc trimmer 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.
5. Greenworks 80V 16-inch Brushless
The Greenworks 80V trimmer 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. 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.
6. Ryobi 40V Attachment Capable 15-inch
The Ryobi 40V trimmer 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.
7. Worx WG185 — 40V with Dual-Exit 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. With two batteries, you can keep cutting while one charges. The dual-exit design also wastes less line compared to single-exit heads.
The Right Line Makes All the Difference
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.
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. 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?
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.
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.
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