Does anyone know when exactly tree peonies start growing their feeder roots?
I have got lavender Hill on its own roots and some cheap tree peonies from the grocery store and kept them in the pots till the fall. I remember that I was surprised by how many feeder roots they had that fall. However, I don't remember when I planted them, but I would like to know when exactly they started growing their feeder roots. In September, October, or perhaps in November? I assume the temperature must drop to a certain point, or maybe not? Does anyone know? Please enlighten me
