And wild it is. Kay dries a lot of it for seasoning. Each year I have to beat the bed back to a more reasonable size. It has a spreading root system that if undisturbed would take over the world. The cultivated sub species is O. v. hirtum which does not grow well in shade as does its wild cousin.
Pungency declines in rich soils and after flowering so pick it in mid-summer.
Our heavy clay is far from being rich so that aspect need not concern us. Just say no. I am still pulling it out when it again pops up. Somehow small bits of root manage to remain behind. Shepherds Crook, Gooseneck Loosestrife , Lysimachia clethroides, is another one.