Crab grass??? - Knowledgebase Question

Lexington, Ke
Avatar for dmdiane
Question by dmdiane
August 11, 2010
Last year we had very litle crab grass - it was undercontrol. We live in Lexington, KY and this year the lawn is being taken over by the crab grass. Any solutions to get my nice lawn back?
Thanks, Diane

Answer from NGA
August 11, 2010
How annoying! The good news is that crabgrass is an annual weed and will die out when the weather cools. The bad news is that even if you pull it out by the roots, it will leave seeds in the soil which will try to sprout next spring. Crabgrass starts germinating when soil temperatures are 50 to 55 degrees F for ten or more days and germination can take place over a 6 week period. Pre-emergence herbicides provide excellent weed control for crabgrass but they last only about 30 days. The compound prevents the weed seed from germinating, but it will not kill the newly sprouted seedlings. Late March to early April is an ideal time to apply pre-emergence control in your region, but watch the weather patterns and apply sooner if the weather warrents. A second application might have to be made to keep your lawn a little more crabgrass free. At this point, you might want to try raking it out or hand pulling. Depending upon the type of turfgrass you are growing, there are some products that specifically target crabgrass but not some types of turfgrass. If you use one of these products, make sure your grass type is listed on the label. Next spring use the pre-emergent, reapplying in 30 days. That should keep the crabgrass under control. Best wishes with your lawn.

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