I have had a tree peony for three years. It’s a beautiful light pink flower that blooms early June. I have not moved it since I planted it three years ago. This year there was new “non-tree” peony shoots that grew out the bottom that are a totally different variety of peony than what the tree is. My question is, do I try to dig down and separate the peony growth from the tree peony growth? I’m worried it will hurt the healthy tree. Or cut it back? Why would a new variety (that I do not have in my garden) grow after three years? Help?