Dear Jim, I'm growing some Arums here. They bloom at the end of the growing season. E.g.: A. cylindraceum defoliates after the inflorescence has passed. This is the same with Dracunculus. Arisaema and Pinellia flowers at the beginning of theig growth. Corydalis behaves the same, 2 weeks after the flowers have died off seeds ripening and the same time the plant yellows. I think, this is because they grow in woods. Bye, Jani