Poa annua is a misnomer, it can be an annual or perennial. In cooler wet climates (or in heavily irrigated lawns), it tends to more often be a perennial. If it dies in the summer, completely, then it is an annual. If it stays alive, it is a perennial.
There are some expensive herbicides that can kill existing annual poa annua, but they perform very poorly on perennial poa annua.
The best way to control annual poa annua is by using pre-emergents in the fall just before soil temps fall below 70F, and in the spring just before soil temps rise above 45F.
Perennial poa annua is very difficult to remove. It requires adjusting your care practices and improving drainage. I wrote a guide on the topic here https://www.reddit.com/r/lawncare/s/FPXEymJJ2P
Marley3102
Agree with Niles, Tenacity is a very weak pre emergent at best and can cause more harm than good if not precisely applied to existing turf. If you never applied it before, the odds of damaging your turf is huge. I’m in SoCal and tried it during my overseed last fall and just an inch of overlapped spray will cause a horrible looking lawn for months. If you are a precise and seasoned sprayer, go for it. I also used the $$ velocity pm which did work on poa but had ugly ass turf lasting about 90 days.
3 Comments
No, tenacity will not kill existing poa annua.
Poa annua is a misnomer, it can be an annual or perennial. In cooler wet climates (or in heavily irrigated lawns), it tends to more often be a perennial. If it dies in the summer, completely, then it is an annual. If it stays alive, it is a perennial.
There are some expensive herbicides that can kill existing annual poa annua, but they perform very poorly on perennial poa annua.
The best way to control annual poa annua is by using pre-emergents in the fall just before soil temps fall below 70F, and in the spring just before soil temps rise above 45F.
Perennial poa annua is very difficult to remove. It requires adjusting your care practices and improving drainage. I wrote a guide on the topic here https://www.reddit.com/r/lawncare/s/FPXEymJJ2P
Agree with Niles, Tenacity is a very weak pre emergent at best and can cause more harm than good if not precisely applied to existing turf. If you never applied it before, the odds of damaging your turf is huge. I’m in SoCal and tried it during my overseed last fall and just an inch of overlapped spray will cause a horrible looking lawn for months. If you are a precise and seasoned sprayer, go for it. I also used the $$ velocity pm which did work on poa but had ugly ass turf lasting about 90 days.
Looks like your common Dandelion.