Climbing roses are pruned just like their short and stout counterparts, with one exception: Climbing roses that have one beautiful flush of bloom in spring should be pruned after they flower so as not to clip off the developing flower buds. All other climbing roses can be pruned in late winter. Use a pair of sharp pruning shears to cut away dead, diseased, and weak growth. Tidy up the roses' form by cutting wayward stems back to ground level and heading back vigorous stems by 6 inches or so. Always rake up the clippings after pruning roses. This will help control the spread of diseases such as powdery mildew, black spot, and rust.