when to use pre-emergent - crabgrass
based on last year's disasters, I am looking at a major crabgrass infestation this year.
I'm in central Ontario. When would be the best time to put down
a) a pre emergent crabgrass product (although so far I've seen only weed and feed in the stores, nothing specifically for crabgrass
b) Corn gluten meal. I don't really think that CGM alone will be able to help me deal with this stuff but perhaps I could try a combination of the two, in order to use less chemicals?
When things warm up here, they warm up very quickly, and I don't want to miss the chance to address this problem.