pruning/cutting off a trellis
I have a clematis that blooms mid to late summer, has clusters of small white blooms. Can't remember the name but think the name included "lace". This is it's third year. It has grown up a trellis and the top of the trellis looks like a dead bush. From the ground to the top there is not much coverage or blooms, at the top it's very full. I've never cut it back. It looks awful. The whole top of the trellis is brown and thick. Birds are nesting in it. Should I cut all that off the top of the trellis? I'm not sure what to do.