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     TX Organic Research Center

 

 

CURRENT MOON
 
Annual Blue Grass (Poa annua)
 

This small cool season grass is a particularly serious weed problem in closely mowed areas. It begins to emerge in late summer and early fall when night temperatures are in the 60s and moisture is present. Annual bluegrass seeds continue to germinate through the fall, winter and spring making chemical control more difficult. Favored by 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 in late fall and winter, but seed head development is greatest in the spring and early summer. Can be controlled to some degree with pre- emergence products like corn gluten meal and post emergent organic herbicides like vinegar.

 


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