this is my first post here. i live in zone 8, new orleans, louisiana and i'm in battle with several plants for my yard. i've figured out a couple of 'em like the four o'clocks and the mexican petunia, but i can't figure out what these are.EDITED WITH MORE INFO: they also stink when you pull them out by the stalk. they grow very proficently. these were left alone to grow through the summer and reached over six feet tall before i yanked them 7 weeks ago. now more are coming up where these were, and they are already almost three feet tall!
these are everywhere and they come back whether i dig em up or saw 'em off. i need some serious intervention.