Annual Blue Grass (Poa annua)
Bluegrass, Annual (Poa annua) Small cool season clumping grass that begins to emerge in late summer and early fall when night temperatures are in the 60's and moisture is present. Annual bluegrass seeds continue to germinate through the fall, winter and into spring making control sometimes difficult. It likes moist soil conditions and cool temperatures. It has a strong competitive advantage over warm season grasses from fall through spring. Annual bluegrass is greatly reduced by taller mowing heights and limited use of water. Seed heads form in late fall and winter, but seed head development is greatest in the spring and early summer. Control with pre-emergence herbicides like corn gluten meal and contact organic sprays like PureGro Weed Crush. It can also be treated with the AgraLawn Crabgrass Killer product. It also helps to keep the seed heads mowed off.
This grass, considered a weed by most people, explodes the worst when the weather is erratically wet and dry and/or hot and cold in the fall and winter.
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