When I transplanted my peony, I accidentally brought with it, in the clump of dirt, a sprig of aster. This year, the peony bloomed for the first time very exciting! however, I noticed that the aster is growing right around the peony...encasing it in a circle, if you will. If this is overcrowding, the aster must go, but I don't know if roots are intertwined and I will damage the peony. What should I do, and when should I do it?
