I planted a mix of perennial ryegrass and fine fescue after leveling my yard in the PNW last spring. I also over-seeded in the fall and noticed some bright green patches coming up. Is there a way to eventually get rid of this bright green grass? Is it Poa Annua? I would really appreciate any advice for this year
https://www.thisforum.com/r/lawncare/s/Qa9nezuXsA
It’s not easy or straightforward. In the PNW, it behaves more like a perennial, so pre-emergents might not work well.
Vesper said:
Just let it grow
And you’ll probably annoy your neighbors who don’t want Poa
It’s definitely Poa. It can be really tough to deal with. Pre-emergents can help sometimes, but I get more complaints about it than anything else, except maybe Dallisgrass.
Tenacity does not control Poa Annua
To control Poa Annua (which is likely what those seed heads are) you should act in the fall when soil temperatures drop below 70 degrees. A pre-emergent like prodiamine can be useful. If you choose this route, you probably shouldn’t overseed as you usually would.
Another option is ethofumesate (Poa Constrictor) which is safe for tall fescue and most cool season grasses, even when seeding. I’ve seen good results and I’m trying it out this season.
A spring application of prodiamine helps with crabgrass but won’t stop this year’s Poa Annua which has already sprouted.
@Keller
You can check your local soil temperatures here.
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