How Do I Get Rid of Poa Annua (Annual Bluegrass)?

Poa annua grass germinates in the late fall or early spring. You may be able to control poa annua with Green-Up with Crabgrass Preventer. For effective poa annua control, apply Green-Up with Crabgrass Preventer in early fall and again in early spring. This will keep the poa annua seeds from sprouting. But keep in mind that poa annua seeds are tough and can survive many seasons without germinating. This method will work towards reducing poa annua in the lawn over time. You will need to treat your lawn for many seasons in order to rid it completely of this weed. There are some herbicides that will selectively kill poa annua in lawns, but they can only be applied by certified professionals. Round-Up will also kill poa annua, but it will also kill any other plants that it comes in contact with. Avenger, non-selective organic spray will also kill poa annua, but it will also kill any other plants that it comes in contact with.

The downside to treating with Green-Up with Crabgrass Preventer is that you cannot seed for 4 months after application. 
  • Avoid Overwatering 
  • Poa annua prefers shady and damp areas. If you water deeply and infrequently, its shallow roots won't be able to reach down to where the moisture is. 
  • Set Your Mower High (3 - 4 inches)
  • Poa annua is short. When you mow your grass high, between 3-4 inches, you make it hard for annual bluegrass to survive. Lawns with taller grass tend to have very few Poa annua problems.

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