Hello. I planted 9 Helen von Stein lamb's ears this spring from quart size nursery cans. They are already 2 feet wide! I love them and they make a big statement. My question is, will they keep growing like this and I will need to divide them every year to maintain this size or should they stop spreading soon and stay around this width since most websites say it grows 12-24 inches wide? If you have this plant, how often do you divide it? Thank you!