Courage to prune
Failed-flowers newbie question:
My yard has clematis growing 12-15 feet long over an arbor and along the top of a tall fence, with almost no blooms, since I didn't know which variety they were. I've concluded they must be group 3, so I'm going to prune.
But the trunks near the ground are the thickness of my thumb, and branching. Do I cut way down to 12 inches from the ground on these main trunks, or 10-12 inches up the assorted branches?
There is a tangle of vines from previous years, of course, but letting them do their own thing last year just produced foliage.