Posted: 01/04/2014 at 10:53
Hi Lottie, Crystal Fountain is a group 2 Clematis so shouldn't be pruned until after it flowers and then only lightly or to keep it in bounds. If it's very tangled you can sort it out when it's dormant usually Jan/Feb ( it may be too late to do it this year if it's already put on a lot of growth but if it's just budding you can) carefully working from the top of each stem cut off all the dead leaves which will enable you to untangle them from each other, do one stem at a time and lay the stems out on the ground as you go. When they are all separated tie them in to their support as you want, try and leave a four to five inch gap between each stem so they won't wrap themselves around each other quite so much, you can fan them out so you get a larger flowering area and they are flatter to the trellis, which looks much tidier. Laying the bottom ones almost horizontal also gives you flowers from top to bottom.