Garden parsley seems to keep going until it blooms and makes seeds here, however long that takes it. Guess I need to start seeds now...I lost all of the ones I had last year...but there was enough for the few Black Swallowtail caterpillars that showed up. There's one wild kind of parsley that's strictly annual and I haven't seen any of those make it through the summer...they come up in spring and once they complete their seeding out, they die.