I have a number of patches of Poa Annua in my 15k of turf. The worst areas are on the north side of tree's which I assume survive the most even during the heat of summer as they do not get blasted with sun all day long. ( Maybe I'm dead wrong here) I'm planning on killing some of the sections with gly, vigorously raking and adding some compost to the existing soil. Breaking this years Dimension barrier and reseeding with Lesco 50/50 KBG/Rye, which I used to over seed last year with. I'll then plan to utilize an late summer / early fall application pre-emergent in an attempt to lower this years seeds from germinating. My question surrounds the Poa Annua - Annual Bluegrass seeds. Once the pre-emergent is put down, is that season's seed crop then destroyed or do they lay dormant just waiting for an opportunity to sprout. Thanks in advance.