I've had problems with some euphorbias being overly aggressive, and others that behave better. 'Fens Ruby' is problematic for me, but not so much for my sister (a couple zones cooler than me). 'Excalibur' will reseed itself but so far not too aggressively. E. polychroma doesn't seem to self-seed, but is easy to divide. I don't know what the annual form of spurge is (mine are all perennial), and noted that we have no photos in the database - perhaps one of you who battle this as a weed could take a minute to snap some photos before yanking? Always helpful to visualize the enemy.
