I killed the mint the same way I may have killed the rosemary, by ignoring it! Maybe I should check out the roots, maybe it's still saveable with a good soaking. There's just no visible plant left in that pot, whereas I still had a visible rosemary plant, it was just all brown. Not sure if its a good sign or normal, but it still smells very pungently of rosemary, so maybe I just need some help from Miracle Max?