Pruning clematis montana rubens
They tend to be quite robust with regards to pruning so no need to worry about pruning it too hard. In the first season the pruning should be more about training tieing in shoot to get the plant to grow in the direction and areas you wish it to grow. Then in the 3 or 4th season you will need to prune it back to this framework you have created as montana rubens tend to become very woody. Hoever the good news it that if pruned back to bare stems they shoot quickly from dormant buds and if pruned in the winter or early spring they will flower on this new growth.