I have a vigorously growing Clematis which flowers April/May. When should I cut this back and how far ?
Paddy, that sounds like a Montana. Cut it back after flowering as hard as you like.
Thank you. It is beautiful when in flower but it is now hanging over the garden seat. Once it has flowered I will cut it back.
But Montana clematis is category 1, which doesn't need pruning. It flowers on old wood. If it has got far too big and outgrown it's place you can cut back and trim after flowering.
Thank you Will cut back after flowering to enable me to enjoy my garden seat OR move the seat !!