1) A large flowered hybrid making its comeback form a complete cut. It won't bloom for so long a time this year as when it goes un-cut. However, it will bloom wonderfully beginning a bit later than usual.
The smaller flowered later blooming species clematis, such as C. viticella, C. violacea and C. texensis can simply eb cut all the way to the ground every year.

2) This blue bush clematis (Clematis heracleifolia; I know it looks like a drunken spray of gray lines!) can be cut the the ground (right arrow - lots of new growth coming there). Alternatively, cut its existing canes to where strong new growth is coming (left arrows).

3) Here's a large flowered hybrid before cut, right after the April 1 cut, and a week later.



If anyone has any photos that illustrate how to decide which canes to cut to renew a large-flowered hybrid or a spring bloomer, or how to shorten its branches, we'd love to see them here. So many people ask and so far we haven't managed to be working on a Clematis when the light's right. When the light's wrong, it's just a mass of undecipherable shadows at the base of a clematis!