Type: Annual Bluegrass
Size: The stem grows from 6″–10″ high
Where it grows: Moist lawns.
Appearance: All tasseled seed stalk that will typically stand up above the rest of the lawn and becomes visible in late spring or early summer. But, while this seed stalk can be tall, if it is cut short, it can still produce seeds.
Control: pre-emergence herbicide in lawns that will prevent the poa annua seeds from germinating.
Note: The plant will produce several hundred seeds in eight weeks, and the seeds can lay dormant for several years before sprouting.