You prune them when anytime after they have finished flowering and the leaves have started to drop, but its easier if you wait till the plant starts to bud up again as you can see better where to cut back to. Ideally you would cut to an outside bud so when the rose begins to grow its shape is vase like, so that it allows good air flow that will reduce disease. Remove anything growing inwards.
You are doing this to promote good new growth for the spring, and it improves flowering. It helps also to dead head your plants for a longer flowering period( removing dead flowers)Reduce plant to about a 3rd of its size.
Happy Gardening
When is the best time to prune roses, spring, fall and why?
Well.. in the Spring (Actually, I prefer March)is the best time.. that is when I always prune mine... But exactly when depends on where you live.. thus, timing is determined by the class of the rose plant and the zone in which it is growing. Most rose pruning is done in the spring, with the blooming of the forsythia as a signal to get moving. If you don't have forsythia, watch for when the leaf buds begin to swell on your rose plants, meaning the bumps on the canes get larger and reddish in color.
Hybrid tea roses are the most particular about pruning. If you don't know what type of rose you have, watch the plant for a season. If it blooms on the new growth it sends out that growing season, prune while dormant or just about to break dormancy, as stated above. If it blooms early, on last year's canes, don't prune until after flowering.
Reply:Taken from: http://msucares.com/pubs/publications/p0...
"Prune roses each year between February 20 and March 15. Pruning roses isn't difficult, but it does require sharp tools. The hybrid teas, grandifloras, and floribundas are all pruned in a similar manner.
First, remove all dead or diseased-looking wood. Then cut out all the weak canes or any branches that are growing inward toward the center of the bush.
For the hybrid teas and grandifloras, select 3 to 6 strong canes and cut them back to a height of 12 to 18 inches. With floribundas, it is often desirable to leave more canes of a greater height (24 to 30 inches), depending on their location in the landscape.
You will prune climbers less severely and at a different time from bush roses since they produce their flowers on wood of last season's growth. They should be pruned following bloom. In general, pruning climbing roses usually involves shaping the plants to a desired growth pattern or the complete removal of one or two of the oldest canes."
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