crabgrass eradicaton - Knowledgebase Question

Louisville, Ke
Question by janisross
November 29, 2010
I have a lawn full of crabgrass. What month in the spring dhould I apply a crabgrass kill herbicide? How many applications and is there anything organic for sale at Home Depot that will kill the grass?


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Answer from NGA
November 29, 2010

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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. They are corn-gluten meal based which I consider organic. The compound prevents the weed seed from germinating, but it will not kill any newly sprouted seedlings. Watch the weather - late April to early May is usually a good time to apply pre-emergence control. A second application might need 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 the crabgrass. Next spring use a pre-emergent, reapplying in 30 days. That should keep the crabgrass under control. Proper lawn maintenance practices can limit crabgrass invasions. A dense stand of turfgrass prevents the weed from germinating and establishing.

There are a number of corn gluten based products on the market. Here's a short list, with manufacturer's in parethesis: (All Star Trading) Safe Lawn; (Collingwood Ethanol Value Products UCL) Amaizely Green; (Down To Earth Distributors) Corn Weed Blocker; (Fertrell Company) Weed Ban; (Gardens Alive!) WOW!; Manning Agricultural Center, Inc. (Preen Vegetable Garden Weed Preventer); (R-W Milling Company) Gard'n-Wise Organics; (Scotts Company) Scotts Turf Builder and Lawn Pro; (Soil Technologies Corp.) Dynaweed; Wilbur-Ellis Company) A-Maize-N; (Woodstream Corp.) CONCERN Weed Prevention Plus. I'm sure Home Depot carries Scott's and Concern and may have the others, as well.

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