Climbing roses are able to produce two different types of shoots. There are flowering canes and the main structural canes. While looking on how to make a trellis for roses, you should make sure that it is firmly anchored within the ground and that it is strong enough to stand under the weight of a mature plant. When trellis is against the wall, you should put the trellis away of the wall to let the air circulation and the maintenance. While making the trellis, you should also keep in mind how you can get access to the rose when you need to prune them. Long structural canes should be woven or tied to the trellis so that they can be off the ground.