SELECTIVE HERBICIDE? WHEN?/ - Knowledgebase Question

Mattituck, NY (Zone 6B)
Avatar for sandy52643
Question by sandy52643
April 28, 2007
How do I get rid of crab grass in my lawn with a selective herbicide? Can I do it now? Also can I fill in the bare matches with new grass seed after putting the herbicide down?
thank you s coleman

Answer from NGA
April 28, 2007
Crab grass is an annual weed that grows from seed each spring. It is usually treated by applying a pre-emergent crabgrass preventer product such as corn gluten in early spring, about when the forsythia blooms in your area. It is applied so early because it germinates very early in the season. These products work by preventing the crabgrass seeds from germinating and so can't be used at the same time you seed a new lawn -- they will prevent the desired lawn grass from germinating also. It is always a race to get the lawn grass up and going before the crabgrass takes over, unfortunately.

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