Last year at this time I was getting ready to apply a preemergence herbicide to control the crabgrass in my lawn. This slow warming of the soil means the germination of crabgrass will also be delayed unless we receive some very warm, sunny days in the next couple of weeks.
Seeds require warm , moist soil conditions and light for germination.
If uncrowded and undisturbed, a single plant may easily cover 6-10 feet in diameter. Plants are prolific seed producers in that a single plant can produce up to 150,000 seeds before a killing fall frost. Iowa State University , Ames, Iowa. This information subject to a usage policy .