Clems are done from 'internodal' cuttings. So take a pice of stem of clematis, a light brown one rather than green. Cut about an inch below a pair of leaves and about an inch above. Remove one of the leaves, or if the stem is really thick split it down the middle to leave 2 pieces with one leaf each. Push the cuttings into standard seed compost (I must say I use pure sand, but that is another story!) Water well and cover with a plastic bag and wait!