Pruning Clematis depends upon what kind you have. Different varieties are pruned at different times of the year. First of all you need to identify when your Clematis blooms and what kind it is. Those that bloom on old wood (C. florida, Montana and patens) need nothing beyond removing dead wood. C. lanuginose, jakcmanii and viticella bloom on current season wood and may be cut back in spring before growth begins.