In case anyone doesn't realize, ALL mints (and closely related perennial plants) do this - only the woody or weaklings behave. Thus, most salvias are OK, at least up here, as is Corsican mint, but every variety of spearmint, peppermint, water mint, horse mint, lemon balm, bee balm, and mountain mint I've ever had has tried to take over the garden. They just vary in their success rate!
I admit to growing them in the ground, but I do yank the extras up by the foot - they make a popular Freecycle item around here.
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