Welcome to DU! The truly grassroots left-of-center political community where regular people, not algorithms, drive the discussions and set the standards. Join the community: Create a free account Support DU (and get rid of ads!): Become a Star Member Latest Breaking News Editorials & Other Articles General Discussion The DU Lounge All Forums Issue Forums Culture Forums Alliance Forums Region Forums Support Forums Help & Search

SheltieLover

(83,081 posts)
Fri Jul 3, 2026, 02:46 PM Jul 3

What can I use to get rid of crabgrass without harming groundcover?

I detest chemicals, but this crabgrass (just a small patch) is very problematic as it grows about 100 xs quicker than the rest of the lawn.

Tyia!

Ps: Bonus if such a product exists that is not harmful to animals, bees, etc.

21 replies = new reply since forum marked as read
Highlight: NoneDon't highlight anything 5 newestHighlight 5 most recent replies
What can I use to get rid of crabgrass without harming groundcover? (Original Post) SheltieLover Jul 3 OP
Claw it out with a weeder bucolic_frolic Jul 3 #1
Ty SheltieLover Jul 3 #3
From what I read: manual (especially after nice rain), vinegar+dish soap+ niyad Jul 3 #2
Tyvm SheltieLover Jul 3 #4
It was also suggested to aerate if possible. Seems soil compaction niyad Jul 3 #5
Ty SheltieLover Jul 3 #6
A stirrup hoe if it is small GreatGazoo Jul 3 #7
Ty SheltieLover Jul 3 #9
Boiling water narrow spout Ponietz Jul 3 #8
Ty SheltieLover Jul 3 #10
how small is the patch? NJCher Wednesday #11
It's probably 30' or so by about 20' and in the middle of grass. SheltieLover Wednesday #12
too big for my proposed solution NJCher Wednesday #13
Wow, 2 seconds after I posted that NJCher Wednesday #14
Ty! SheltieLover Wednesday #15
solarizing crabgrass patch NJCher Thursday #16
Thx, Cher SheltieLover Thursday #17
I'm still thinking.... NJCher 23 hrs ago #18
This crabgrass is growing like crazy. SheltieLover 23 hrs ago #19
I learned from NJCher 7 hrs ago #20
Oh gawd... SheltieLover 6 hrs ago #21

bucolic_frolic

(56,503 posts)
1. Claw it out with a weeder
Fri Jul 3, 2026, 03:04 PM
Jul 3

I used crab grass killer long ago, results were less than mixed. Maybe they've made improvements?

Another trick is to cut the grass high so the taller varieties squeeze out the crabgrass.

Or just pull the seeds when they appear to cut down on next year.

niyad

(135,829 posts)
2. From what I read: manual (especially after nice rain), vinegar+dish soap+
Fri Jul 3, 2026, 03:05 PM
Jul 3

salt, or boiling water.

niyad

(135,829 posts)
5. It was also suggested to aerate if possible. Seems soil compaction
Fri Jul 3, 2026, 03:15 PM
Jul 3

exacerbates the problem. I used to use an old pair of high heels. Some use golf shoes, but the cleats do not go deeply enough. They work fine, however, if one is just sowing clover!

GreatGazoo

(4,821 posts)
7. A stirrup hoe if it is small
Fri Jul 3, 2026, 04:03 PM
Jul 3

a spade if it is bigger. I try to get under it with a shovel and then pull it out.

NJCher

(43,907 posts)
11. how small is the patch?
Wed Jul 8, 2026, 04:42 PM
Wednesday

Describe in feet. Is it in the middle of the grass or is it a separate section? Depending on size, I may have a very easy solution for you.

SheltieLover

(83,081 posts)
12. It's probably 30' or so by about 20' and in the middle of grass.
Wed Jul 8, 2026, 06:14 PM
Wednesday

It's a real PITA because it grows ridiculously quickly.

TYIA!

NJCher

(43,907 posts)
13. too big for my proposed solution
Wed Jul 8, 2026, 07:03 PM
Wednesday

however, let me think on it plus I will ask some other gardeners. I'll post back after I have a chance to do this.

NJCher

(43,907 posts)
14. Wow, 2 seconds after I posted that
Wed Jul 8, 2026, 07:05 PM
Wednesday

An idea came to me. However, I need to do a little research to tell you the best way to take care of it.
BB after I do this research.

NJCher

(43,907 posts)
16. solarizing crabgrass patch
Thu Jul 9, 2026, 12:17 AM
Thursday

First, I checked the organic suppliers and they have non-toxic weedkillers, but I doubt that it will kill crabgrass. To check for yourself, go to Bonide and put in weed killer crabgrass. You'll get entries, but I note none of them specifically say they'll kill crabgrass. I tried this with other organic garden supply companies and found the same.

What you could do if you don't mind how it looks for about a year is solarize it. Some people would use plastic for this, but I wouldn't. I would get as many large sheets of cardboard as I could and lay it over the crabgrass. Then I'd buy straw bales and put it over the cardboard. At $13 a bale, your first round will be less than $100 to cover the space you're looking to cover. I'd be sure the straw is at least 10" thick.

Your second round will come just as you go into winter.

Like I said, you'll have to tolerate this patch for a year to kill all that crabgrass. OTOH, it will enrich your soil as it breaks down and when you re-sow the grass, it should be pretty nice.

Next spring, before seeding directly, I'd clear out the straw and put plastic over this section and let the sunlight kill any seeds that are left. You don't want to rake the ground, but it's ok to rake if cardboard is underneath. Then pull up the cardboard after you've raked the straw raked into one pile.

If you go this route, I'll give you tips on where to get large pieces of cardboard.

I have a feeling you're not going to want to do this, but it's the only thing I can think of that keeps dangerous pesticides away. Even high test vinegar, should you put it on that stretch, will ruin growing anything there for the future. The pesticides you already know about--like killing your ladybugs and parasitic wasps.

SheltieLover

(83,081 posts)
17. Thx, Cher
Thu Jul 9, 2026, 09:01 AM
Thursday

I wouldn't mind the cardboard & hay, but this redneck town would likely complain.

I appreciate all the time & effort you put into this, but I can't do this.

SheltieLover

(83,081 posts)
19. This crabgrass is growing like crazy.
Fri Jul 10, 2026, 09:59 PM
23 hrs ago

About 6" in the 2 days since landscaper was here mowing. I'm just not willing to spend my money this way & might need to resort to a chemical that will kill it but not the groundcover & violets.

NJCher

(43,907 posts)
20. I learned from
Sat Jul 11, 2026, 02:18 PM
7 hrs ago

the lawn forum at Reddit that there's nothing that "really" kills it. It always comes back, no matter what you use. You can use the most dastardly poison out there but it still won't kill it.

I have some better ideas. Just give me a little time to check some stuff out.

Latest Discussions»Culture Forums»Gardening»What can I use to get rid...