dividing physocarpus/ninebark

Question

is it practical?

Answer 1

Its much easier and less risky strategy is to start a second plant from stem cuttings or suckers. Here is the how-to. https://www.gardeningknowhow.com/ornamental/trees/tgen/how-to-root-cuttings-from-various-shrubs-bushes-and-trees.htm