Most people choose to control poa annua with a pre-emergent herbicide. This is a herbicide that will prevent the poa annua seeds from germinating. For effective poa annua control, apply a pre-emergent herbicide in early fall and again in early spring. This will keep the poa annua seeds from sprouting.

Herbicides with Atrazine will both kill Poa Annua and work as a pre-emergent herbicide that prevents additional Annual Bluegrass seeds from sprouting. It can be used in spring, summer, or fall to prevent Poa Annua and broadleaf weeds at the same time.

Seeds are difficult to harvest because Poa annua has a plastic phenotype (one that can change). The desirable grass plant at low mowing heights produces an undesirable seed when the plant grows tall enough to be harvested. ... Most people consider annual bluegrass an enemy.

Poa Annua Chemical Control If you have identified the problem early on and only a few weeds are present, Poa annua can be pulled by hand and may not grow back again. ... However, if annual bluegrass has already established itself, a post-emergent herbicide will be necessary.