I just saw this post over at Eli’s Place, in which she wonders if she has a lousy weed… or a useful gem.
My vote is on the latter.
Here’s some photographic proof from last year’s garden, in which I let one of those mystery weeds go to bloom:
Butterflies, bees, ladybugs, wasps… every pollinator and insect you can imagine hangs out on these plants. They bloom late and grow about 6’+ in my yard.
As ID’ed in the comments on Eli’s post, it’s a Eupatorium serotinum.
Definitely a “keep.”