The BEST source says it’s time to kick back your crabgrass

Madhuri from Chantilly writes: “Crabgrass has been my main lawn concern for many years now. I know you recommend using corn gluten meal as a crabgrass-preventing pre-emergent just as the ground temperature reaches 55 degrees. Are we there yet?”

It’s not the temperature at ground level that determines the optimum time to apply a pre-emergent herbicide, Madhiri