crabgrass - Knowledgebase Question

jackson, Oh
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Question by klswick
August 6, 2010
i am going to pull up crabgrass. it leaves bald spots. what is the next immediate step? i was going to pull, compost, seed, compost and water. i have alot of crabgrass!

and nutsedge....i have alot of it. after mowing or pulling it, what do i do to keep it from re-growing?

Answer from NGA
August 6, 2010
Sounds like a good plan! Crabgrass is an annual weed and it will die out over the winter months but the seeds it leaves behind will sprout next spring. The best way to prevent an invasion again next summer is to apply a product in March or April that will prevent the seeds from germinating. There are lots of pre emergent herbicides that you can use. Scotts Turfbuilder with Halts will both feed your lawn and keep crabgrass from sprouting.

Nutgrass (nutsedge is its proper name) is indeed a pesky foe! You have several options for controlling it. Although none of them are quick and easy, they will work if you are diligent. Assuming it is in the lawn, you can hand dig the nutlets. Then wait a few days for more to sprout and remove them immediately. A second option is to spray the nutsedge with a herbicide containing glyphosate (such as Roundup). However, if the nutsedge is in your lawn, glyphosate will kill the grass as well. You can paint the herbicide on the individual nutsedge blades. Each time it returns, you have to reapply. Nutsedge is tenacious, and whatever method you choose, keep after it regularly. If you let it get a hold again, you've lost ground! The key to any approach is to never allow it to reestablish and regain its stored reserves, which are in small nutlike tubers below ground. Keep forcing it to use stored reserves to send up more growth and then quickly dig or spray it again. You will win the battle if you don't quit!

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