crabgrass eradicaton - Knowledgebase Question

Louisville, Ke
Avatar for janisross
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?

Answer from NGA
November 29, 2010
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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