Not the best picture, but I had something simiar growing in my yard, I bought it at Lowes one year and it was labled "Dragon's Tongue". It grew really fast and as you can see had white little blooms. I had it for several years, and it was not invasive for me, but the soil in this area was clay-like and a little dry up next to the east side of the house. I have since tried to find the plant again but with no luck. I guess I could mail order, but didn't want to spend that much. Anyway, I think this could be the same plant you seen? I understand you all are saying it is invasive?
