When does crabgrass germinate?
Crabgrass is a very tough weed to control—once it is up and taking over your lawn. Crabgrass is an annual weed that dies off at first frost but seeds may lie dormant one year, germinate the next. The best practice a homeowner can do is to apply a preemergent herbicide to prevent crabgrass from ever taking hold.
Crabgrass will germinate when soil temperatures are around 55-60 degrees Fahrenheit. Soil temperature. Not air temperature. There is no magic date for when the soil will hit this temperature so you cannot rely on a calendar. The tips below should help you time when you should put down a crabgrass preventer.
Tip 1: Crabgrass generally germinates when lilac bushes start to bloom
Tip 2: Apply after the second mowing
Do not apply fertilizer to a frozen ground. Always read and follow label instructions.