I am bad.

I carefully started plants from seed and planted them out in my yard. They look lovely. They're growing well. Unfortunately, I was looking through some wildflower and invasive plant sites and it turns out that I'm planted an invasive plant.

Oops.

Guess I'd better rip them up.

Edited to add useful links,

Botanical Club of Cape Cod and the Islands
Garden in the Woods
Invasive Plant Atlas of New England

And, last but not least, The Evil Plant I Introduced to the Pristine Eco-system of Cape Cod.