Poa is a nightmare if you don't stop it in time. Produces billions of tiny seeds that are carried by the wind and spread everywhere. No specific herbacide works; you need to kill all the grass and start over again. Or, just mow every day during the season to keep it at the same height as the other grasses. All the Poa will turn yellow and die out soon, and many will think the problem is "over". But it will return in the Spring (or possibly this Fall) and be worse than it is even now.
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