Volunteers that popped up late summer 2017, slow growth over winter, so leaves are small & plants are short — during summer they’ll get 5 ft tall even outside.  We’ve also had plants overwinter outdoors.  Tough guys!  I need to learn more about how these plants affect bees that visit; nicotinoids are very toxic to them.  (BTW, those are shallots in the background, not weeds, but plenty of cleanup is overdue!)