Can I root prune to control clematis size?
Rather than remove a Clematis 'Duchess of Albany' which overwhelms it's space, I'm wondering if I can reduce the root ball by a third on each side. I have the plant on a trellis which is 10 feet tall by 42 inches wide and the plant gets two feet taller (then cascades down) and is easily six feet wide, covering it's neighbors.
Does anyone have any experience in root pruning a clematis?
Thanks for any help.