I know barely enough to be dangerous so no, but I have a crop of that again this year too. I think that germinates in the fall, so maybe pre emergent makes sense in the fall too? I need to research it because each spring the hairy bittercress gets worse here. I just know that the crabgrass pre emergent lasts three to four months depending on the weather and there are various types of crabgrass that germinate at different times of the spring and summer.
27 here currently.