Cornwall,
United Kingdom 
how to prune climbing roses.do you cut off forward growing stems
20 Jul, 2010
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If they are flexible enough, they can be trained on the trellis as new parts of the main structure. Otherwise, just cut them off as close to where they sprouted as possible. If they are just short shoots from the upper stems, cut them back to 15 cm long, and they will give more flowers next spring.
20 Jul, 2010