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Old 07-13-2011, 11:53 AM
 
Location: Cypress, CA
898 posts, read 1,816,775 times
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I am having crab grass problem with my lawn. I tried to dig up the crab grass but it was difficult and left unsightly 'holes' in my lawn. I digged up about 20% of the crab grass already but I am not sure if this is the best method. I have several questions:

1. Is there a herbicide for killing only crab grass?
2. If there is a crab grass herbicide, do I also need to dig the crab grass up too?
3. What to do with the holes? Are there grass seeds that I can used to grow new grass?

Many thanks,
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Old 07-14-2011, 07:32 AM
 
Location: Newport, NC
955 posts, read 3,913,729 times
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There are a couple different chemicals available that will kill crabgrass in a lawn without killing the lawn grass. One of these is named Drive - I'm not sure of the active ingredient. I'm also not sure if it is sold over the counter or if you need to be certified to purchase it.
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Old 07-14-2011, 09:29 AM
 
Location: Oklahoma
468 posts, read 1,463,632 times
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I've had great luck with Ortho Weed-B-Gone Max. There are two types and the "Max" formula is specifically for crabgrass while killing other weeds as well.
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Old 07-14-2011, 10:20 AM
 
25,626 posts, read 34,662,869 times
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Bubba if you have already dug up 20% if your lawn, I recommend killing it all and starting over. You have an infestation, not a problem that can be cured by spraying a selective herbicide.


Ok reread the post 20% of the crab grass. I would recommend calling a professional landscape company that specializes in spraying. The chemicals you need to rid yourself of a infestation can not be purchased usually without a pest control license, unless you can get them from the underground economy.
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Old 07-14-2011, 03:06 PM
 
Location: Cypress, CA
898 posts, read 1,816,775 times
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Crab grass covers about 10% of my lawn right now. I will try Ortho Weed-B-Gone Max first and if it doesn't work then I will go with professionals.

Thanks,

Quote:
Originally Posted by bulldogdad View Post
Bubba if you have already dug up 20% if your lawn, I recommend killing it all and starting over. You have an infestation, not a problem that can be cured by spraying a selective herbicide.


Ok reread the post 20% of the crab grass. I would recommend calling a professional landscape company that specializes in spraying. The chemicals you need to rid yourself of a infestation can not be purchased usually without a pest control license, unless you can get them from the underground economy.
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Old 07-17-2011, 08:49 PM
 
Location: Cypress, CA
898 posts, read 1,816,775 times
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Ron,

I sprayed the crab grass with Ortho Weed B Gone Max and after two days I see some of the crabgrasses turning brown but a majority of them still look very healthy. How long does it take for the crabgrass to die or do I need to spray more?

Thanks,

Quote:
Originally Posted by ron1999 View Post
I've had great luck with Ortho Weed-B-Gone Max. There are two types and the "Max" formula is specifically for crabgrass while killing other weeds as well.
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Old 07-20-2011, 07:06 AM
 
Location: Oklahoma
468 posts, read 1,463,632 times
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Quote:
Originally Posted by jimmybirdie View Post
Ron,

I sprayed the crab grass with Ortho Weed B Gone Max and after two days I see some of the crabgrasses turning brown but a majority of them still look very healthy. How long does it take for the crabgrass to die or do I need to spray more?

Thanks,

I get the same result when I spray my yard with Ortho Weed-B-Gone max. Some of the crabgrass dies within a few days. Some look like they are still green.

I usually wait about a week then tug on some of the crabgrass that still looks green. Most of the time the weeds will pull out of the ground without any real effort. Which tells me that the roots were being killed which is what I wanted.

If you still have really green looking crabgrass after about 2-3 weeks then you can spray another application on your lawn. That's what I do if I need to.
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Old 07-20-2011, 07:13 AM
 
Location: Yellow cottage, green doors.
16,614 posts, read 14,996,776 times
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....perhaps you can try embracing your crab grass and learn to love it!?
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Old 07-20-2011, 08:28 AM
 
Location: Land of Free Johnson-Weld-2016
6,472 posts, read 15,639,859 times
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Quote:
Originally Posted by rainroosty View Post
....perhaps you can try embracing your crab grass and learn to love it!?
LOL I was afraid to say this! LOL Dude, crabgrass is all over my lawn. As is clover, and a bunch of other "weeds." I say live and let live. Honestly, it would probably be impossible for me to get rid of them. As long as they stay out of the flower beds, I try not to care.

Crabgrass is an annual weed, btw and it reproduces by seed. Since the fluffy seed heads seem to be effective in "spreading" their babies, I think even if you get rid of yours, the neighbors' will invade your lawn again. I could be wrong, though.

I think if you keep it cut this year so it doesn't seed, maybe that will help reduce the numbers for next year...
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Old 07-20-2011, 09:16 AM
 
25,626 posts, read 34,662,869 times
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Quote:
Originally Posted by kinkytoes View Post
LOL I was afraid to say this! LOL Dude, crabgrass is all over my lawn. As is clover, and a bunch of other "weeds." I say live and let live. Honestly, it would probably be impossible for me to get rid of them. As long as they stay out of the flower beds, I try not to care.

Crabgrass is an annual weed, btw and it reproduces by seed. Since the fluffy seed heads seem to be effective in "spreading" their babies, I think even if you get rid of yours, the neighbors' will invade your lawn again. I could be wrong, though.

I think if you keep it cut this year so it doesn't seed, maybe that will help reduce the numbers for next year...
Well unfortunately if the OP is truly in San Diego because of his climate it could reproduce year round. Think of the San Diego Climate as a perpetual late spring/ early summer for most of the year. No frost.

We have two type of crab grass in California. The Smooth crab grass variety will still produce seed when cut to a 1/4 inch. As such needs a chemical helper to get rid of the infestation.

However I agree in those areas which have a frost or the soil gets down to below 40, cultural controls will work as well or better but take longer to implement for crab grass control. Maintaining a healthy and vigorously growing lawn in the best way to keep out unwanted weeds.
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