Answer: You could train a clematis onto a traditonal shaped topiary frame if you added a smaller mesh for it to attach itself to. The effect however probably would not be a solid sheet but rather a bit loose and vague. For this reason I wouldn't recommend this as the best vine for the purpose. If by topiary frame however you are thinking of something like a rose pillar or an obelisk, the clematis would be quite charming.
Q&A Library Searching Tips