Thyme, Sage, Mint: Why Don't They Come Back In The Spring?
Has anyone had any success with getting either thyme, sage, or mint to survive a MN winter and come back in the spring? According to what I've read, these herbs are supposed to be winter-hardy (in fact, everyone says that once you plant mint, you'll never be rid of it...!). But I've tried twice now and each time nothing comes back in the spring. Is there a trick to getting them to come back? Could I be doing something wrong? (I have all three in a self-contained permanent planter in my back yard.)
My oregano and chives come back just fine each spring, but these others don't seem to want to. Anyone have any advice?