Well, I just convinced my friend in Minneapolis to buy this lovely plant. We put it in a raised bed planter that's very fast-draining.
Although the tag said hardy to Zone 4, I'm wondering what growers in cold climates do to protect an in-ground semp - is any particular protection needed for the 6+ months of winter? Should she pot it up and keep it inside for the winter, put one of those styrofoam cones over it, or just leave it be? I'd hate to think I've talked her into a rather expensive annual
