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Prepare Now for Annual Bluegrass (Poa annua) Emergence this Fall

Original Source: 
Patrick McCullough, UGA Extension Weed Scientist

Annual weeds establish from seed and complete their lifecycle in one year. Summer or warm-season annual weeds (like crabgrass) establish in spring, grow actively in summer, and die out in fall. Winter or cool-season annual weeds (like annual bluegrass) establish in fall, grow from fall to spring, and complete their lifecycle in warm temperatures in late spring. 

 
Failure to control annual weeds in late summer may predispose turfgrasses to winter weed infestations. In many lawns, it