Cleared out the dead zinnias today, this was healthy and happy under their edge. Stem looks like a young tree. I don't think I have ever seen it though it does look *vaguely* familiar.
Close up of a flowering tip -- can't tell if this is full bloom or not:
This is the whole plant. No others around. If it's a tree it needs to get gone from there; if it's a weed it might be a host for somebody I want to have around -- so have to know its name!
Thanks in advance.