Clematis Grp 3 Pruning - RHS says one thing, GW another
I have a few group 3 clematis (Princess Diana, Arabella and Etoile Violette) and wanted to verify when I should prune them.
The RHS website advises they are pruned in late winter/very early spring when the new buds begin to show, and then pruned to 1ft from the ground. However this website suggests they are pruned now, and level with the ground.
Any thoughts on which works best?