What is it? It seems to be invasive ... should I get rid of it? It grows to about 3 feet, has tiny pink flowers on a prickly stem when it is fully grown. It is now popping up throughout my small garden. I live in Ottawa -- and I believe I bought this from a Nursery, but can't find the tag.
Thank you. It is Motherwort, (Leonurus cardiaca) - I would never have found this on my own. Wonderful help - and so prompt. DorothyMS