9 Steps to a Lush Lawn

Crabgrass germinates when the soil temperature reaches about 56 degrees F, which happens in mid-April in many regions. Wait until your soil reaches this mark for a few consecutive days, then apply a pre-emergent herbicide (or use corn gluten if you prefer a natural product, available at Bradfield Organics. Crabgrass doesn't grow well in the shade, so you don't need to add chemicals in well-shaded parts of your yard.