Hmmm. Wetland, huh. Not in our backyards, in the middle of the city, in the middle of the prairies, so maybe we don't have to worry about it becoming a "pest"! Mine didn't come back this year so one of the others sent me the pictures, 'cuz it's been driving me nuts trying to id it. This time when I looked at her pictures, my first thought was impatiens. Wonder why I didn't see that before. Anyway, I'm going to try it again next year - it was a showpiece in my garden!!