"Poa annua", or annual Bluegrass may be an annual or may be a perennial. If what you have is the annual sub species and you cut the grass before any seeds formed you should not see any new plants germinating.

Corn Gluten Meal, applied in mid September, should give good control of any "Poa annua": annual seeds that try to germinate, and maybe stop germination any of the perennial that might grow, this fall. If your soil temperatures are below 70 degrees F you may still have time to apply CGM.

Most any herbicide that might control "Poa annua" will also kill the grass you want to keep.

kimm1q is kimmsr

I get the same giant poa patch every year, regardless of PreM use & it dies every year once the soil warms up. The soil warms quickly here in the great state of TX! You can try knocking it back with herbicide or just pulling the shallow roots.

Thanks - I guess I'll try a heavier dose of CGM. As much as I'd like a few months off from mowing, my wife likes the poa green backyard in winter... I probably won't spend too much time pulling them out and will not bag clippings. I'm probably stuck with poa until I use herbicide.

I think if you're mowing anyway, you may as well bag so you get some of the seeds out. You won't have much clippings, but the fewer seeds the better IMO.

Keep in mind that most all herbicides are antithetical to organic practices.

All plants, including Poa annua, have a time to produce seeds, they do not produce seeds every day or even every week. Bagging the clippings will do little to keep any seeds produced from spreading, but keeping the grass cut (which can help stop seed production) will help the most.

kimmq is kimmsr