Posted: 10/10/2015 at 12:32
Some varieties will do that when pruned 'normally'. "Peace" is one and if pruned hard in March grows rampantly, so I have to remember to only lightly prune that one. Once done though, it's hard to regain control. I had some luck by continually pruning it from midsummer onwards through the 'rampant' year and then just gave a light trim in the following March. This did result in losing a lot of flowers for one year, just something I had to accept.