Leonurus cardiaca, Motherwort.

Absolutely. Non-native. Best to get rid of it now.

I haven’t had time for more than a quick google search and didn’t find anything indicating that it is particularly troublesome. The fact of a plant being non-native, alone, isn’t a huge problem for me. IME, it seems to stay at the woodland’s edge and is pretty easy to pull up which I’ve done as needed. Other than its being non-native, is there something about it that’s cause for concern?

My own experience with it is that under the right conditions it does become a problem, mainly by smothering out other more valuable native species. It does become a large plant, taking up way too much valuable real estate.

Unfortunately, it's the unknown natives that we will never see that creates the conundrum.

But thanks for asking the question.

Thanks. I don’t disagree, in principle. However, this plant seems to favor a particular area that’s not very large and since it’s an area I’m working on I pull it up when I encounter it. A plant that’s easy to recognize, easy to weed and isn’t allelopathic isn’t going to be as much of a priority for me as getting rid of the massive amounts of garlic mustard or Japanese stilt grass that come up every year.