String or Blade? Match Your Trimmer Head to the Weed
String or blade?
The better question is:
What are you trying to cut?
Soft lawn grass and thick backyard weeds are very different jobs. Instead of always choosing the strongest option, choose the trimmer head that fits what's growing in front of you.
Here's an easy way to do it.
Level 1: Soft Grass & Small Weeds
Think regular lawn grass, clover, chickweed, and other young weeds.
These plants have soft, thin stems and are usually easy to cut.
Best Choice: String
String trimmers work well for:
- Regular lawn grass
- Clover
- Chickweed
- Young, soft weeds
- Lawn edges
If you're simply cleaning up grass around a driveway or trimming places your mower can't reach, string is usually enough.
Don't bring a sword to a grass fight.
Level 2: Bigger, Messier Patches
Now think crabgrass, foxtail, taller grass, and weeds growing together in bigger patches.
They're not always hard to cut.
Sometimes there's just a lot more to cut.
Best Choice: String or Plastic Blade
String can still handle young weeds and smaller areas.
But when the grass gets taller or the weeds grow thicker, a plastic blade can give you a stronger cut.
Plastic blades are useful for:
- Crabgrass
- Foxtail
- Taller grass
- Bigger weed patches
- Everyday yard cleanup
One thing to remember:
Cutting a weed doesn't always kill it.
Some weeds can grow back from their roots. Trimming is great for cleaning up your yard, but weeds that keep coming back may need more than cutting.
Level 3: The Tough Guys
You know these weeds.
You run the trimmer over them once.
They're still there.
Again.
Still there.
Older weeds can grow thick, hard stems that normal trimmer line may have trouble cutting.
Best Choice: Metal Blade
A metal blade can be a better choice for:
- Thick weed stems
- Tough older weeds
- Heavy weed growth
- Overgrown areas
Instead of going over the same spot again and again, a stronger blade can make the job easier.
But stronger isn't always better.
Be careful when using metal blades near rocks, sidewalks, fences, trees, or anything else you don't want to hit.
Level 4: “Is That Still a Weed?”
Then there's that plant.
You look at it.
You look at your trimmer.
You look back at it.
Is that a weed…or is it trying to become a tree?
For very thick growth, brush, or small branches, regular string and plastic blades may not be enough.
A stronger cutting head, such as a saw-style blade made for the tool, can help with tougher jobs.
But remember:
A lawn trimmer isn't a chainsaw.
If the growth is too thick or hard, use another tool made for the job.
The 3-Second Weed Test
Don't know what kind of weed you're looking at?
No problem.
You don't need to know its name.
Just check three things.
1. Check the Stem
Soft and thin → String or Plastic Blade
Thicker weeds → Metal Blade
Very tough growth → Heavy-duty cutting head or another tool
2. Check How Much There Is
A few small weeds?
Keep it simple.
A big patch growing together?
A blade may make the job easier.
3. Check Where It's Growing
Look around before you start.
Weeds growing in an open area are very different from weeds growing next to:
- Fences
- Rocks
- Sidewalks
- Trees
- Flowers
The strongest blade isn't always the safest or easiest choice.
Quick Trimmer Head Guide
| What You're Cutting | String | Plastic Blade | Metal Blade |
|---|---|---|---|
| Regular grass | ★★★ | ★★★ | — |
| Clover | ★★★ | ★★ | — |
| Chickweed | ★★★ | ★★ | — |
| Young crabgrass | ★★★ | ★★★ | — |
| Older crabgrass | ★★ | ★★★ | ★★ |
| Foxtail | ★★★ | ★★★ | ★ |
| Tall weeds | ★★ | ★★★ | ★★ |
| Thick weed patches | ★ | ★★ | ★★★ |
| Thick, tough stems | ★ | ★ | ★★★ |
There's no prize for using the strongest blade on the easiest weed.
Use what fits the job.
What If Your Yard Has All Three?
This is where things get interesting.
A real yard rarely has just one kind of job.
You might have soft grass along the driveway, crabgrass near the sidewalk, taller weeds behind the shed, and thick growth in the back.
Buying a different tool for every job doesn't make much sense.
Another option is using one trimmer with different cutting heads.
One Trimmer. Three Cutting Options.
The CORVELLAN 21V Battery Powered Lawn Care Trimmer uses different cutting heads for different yard jobs.
Plastic Blades — For Everyday Grass
A good choice for regular grass, lawn edges, and light yard cleanup.
Stainless Steel Blades — For Weeds
When the grass gets thicker and weeds become harder to cut, switch to a stronger metal blade.
Alloy Saw Blade — For Tougher Jobs
For thicker growth and small branches, the saw-style blade gives you another cutting option when regular blades aren't enough.
The idea is simple:
Soft Grass → Plastic Blade
Thicker Weeds → Stainless Steel Blade
Tough Growth → Alloy Saw Blade
Instead of making one cutting head do everything, you can change the head to fit the job.
Explore the CORVELLAN 21V Lawn Care Trimmer →
Sometimes, the Best Tool Is Your Hand
Not every weed needs a power tool.
If there's one small weed growing in soft soil, pulling it out by the root may actually be faster.
And if a weed keeps growing back, simply cutting the top may not solve the problem. You may need to deal with the roots.
Also, if you don't know what a plant is, find out before cutting it. Some plants can bother your skin, and a spinning trimmer can throw small pieces around.
Sometimes a pair of gloves is all you need.
One Yard. Different Jobs.
String is great for light trimming.
Plastic blades work well for everyday grass and thicker patches.
Metal blades help when weeds get tougher.
And stronger cutting heads can handle heavier jobs when the tool is designed for them.
So don't ask:
“What's the strongest trimmer head?”
Ask:
“What's growing in front of me?”
Because the best trimmer head isn't always the strongest one.
It's the one that fits the job.