cutting back , is it necessary?

I wish to let my roses climb up the side of the house , the bush has already sprouted a huge long shoot a good ten feet high , its only a single shoot though?
Anyhow , is it necessary to cut roses back each year or can they be left to grow bigger each year?

 

Climbing roses need to be pruned or they will only flower at the top leaving unsightly bare stems, and they are not very attractive.

You take roses up a bit at a time so they flower from bottom to top. You can leave some stems to climb but they need tying in horizontally or they will eventually flop over from the weight of the flowers.