Frillylily said:the blossoms on the one in question look purple
On my monitor the backs of the flowers look brownish with maybe a pink stripe. There's also a hint of pink on a couple of flowers. The branching should be a useful clue even if just for purposes of elimination, but I have no idea what it is at this point. Becky, is it possible to get a close-up of the flowers, maybe with a coin or something to give some scale? You mention it is invasive, is that in the sense of it's being a problem in your general area, or do you only see it in your garden?
