Trumpet vine: Has not been a problem for me - in fact I could never get it to do much of anything, so just tore it out. It went away without any problem. (Pacific NW)
Iris: Roundup is not in my universe, so no, not an option. Plus our farm pond is fed by a salmon bearing creek, so way too dangerous to even think about poison. We've tried digging out twice (with heavy equipment) but the iris are really tenacious and it is difficult to get them all since they are in 2' of water. I co-exist with them.
Euphorbia fens ruby: this was given to me by my sister as a jolly little groundcover. It did quite well in my front border garden. BUT, when I moved some to my rock outcropping, it went buck wild and decided to take over that entire bed. Must like the slope and hot sun or something. It's now on the do-not-fly list for me as I diligently pull it out over and over again. I'm not too tweaky about it, though, it is actually a nice looking plant, just overly enthusiastic.
