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Labor Day – Time to Prevent Poa Annua (Annual Bluegrass)

September 2, 2013

This is a reminder for all of you who have asked me about killing this weed (see photo) back in spring.  Now is the time to put down a preventer.

This is an early spring picture of Poa Annua in a Bermudagrass lawn.  Notice the light colored seeds.

This is an early spring picture of Poa Annua in a Bermudagrass lawn. Notice the light colored seeds.

Lawn weeds like Poa Annua (Annual Bluegrass), Common Chickweed, and Henbit are “winter annuals”.   This means they germinate in fall, thrive in spring and then die during summer, but not before scattering seed so the cycle can start all over again in fall.  (“summer annuals”, like Crabgrass, Foxtail and Barnyardgrass, have the opposite cycle of germinating in spring, thriving in summer and dying just prior to winter, but not before scattering seed so the cycle can start all over again in spring.)

If you vowed last spring that you wanted to stop these winter annual weeds from invading your lawn, you need to pick up a bag Scotts Halts or Scotts Turf Builder with Halts so you can treat your lawn now.  (This is the right product to use even though it says prevents crabgrass.)

Caution:  If you are planning to plant any grass seed this fall, you should not spread weed prevention in those areas as it will keep your good grass seed from germinating.

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2 Comments
  1. Larry permalink

    So….when can you re-seed?

    • Hi Larry
      If you put down this prevention now, you will need to wait till spring to seed. At that time you could use the preventer for new lawns we sell to prevent crabgrass without keeping your good grass from germinating. That preventer does not work on Poa Annua.

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