Reading a gardening blog the other day, I was surprised that some folks think lamb's ear is on a par with kudzu and needs to be eradicated. There were several tactics listed to keep lamb's ear at bay.
We have a thriving bed of lamb's ear which is pretty and absolutely no trouble. Occasionally it will escape its boundaries but it's easy to dig up and put back in it's place.
Remember when I went off about the sumac tree and was chastised by a reader for belittling the tree. I get a dose of my own medicine. We just all need to get along.