Up intil 3 years ago my Henryii Clematis was huge and gorgeous.All of a sudden this healthy plant started to wilt.The plant stayed green, but looked terrible,so I cut it right back and let it rest. The following year the same thing happened but I did manage to get a couple of blooms. This year has started out in the same manner.The plant looks completely healthy one day,and the next completely droopy,but still green. I have almost come to the conclusion that I need to shovel prune it unless some knowledgeable person here can help me out.