The Q&A Archives: crabgrass

Question: What is the best method to get rid of crabgrass, tried spraying but it turned yellow and grew back. Forgot what I used.

Answer: Crabgrass is an annual weed that will die down when the weather cools, but it will leave lots of seeds which will germinate next spring. Pre emergence herbicides applied next spring will keep it from sprouting, providing the product is applied before the seeds germinate. 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 April to early May is an ideal time to apply pre-emergence control. A second application might have keep your lawn a little more crabgrass free. At this point, you might want to try raking it out or hand pulling. Next spring use the pre-emergent, reapplying in 30 days. That should keep the crabgrass under control. Proper lawn maintenance practices can also limit crabgrass invasions. A dense stand of turfgrass prevents the weed from germinating and establishing. Fertilize at the end of May and remember that fall fertilizing, overseeding, aeration and thatch control can also limit spring problems. Best wishes with your lawn.

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