Posted: 10/07/2014 at 11:07
It's simple for me.... Rosemummy, you have been over feeding it. Cosseting it too much. It's enjoying just making growth. Grow it lean now.
Just leave it be. Keep it watered in dry spells though
Just pruned my own philadelphus. Lovely scent from masses of flowers. Only downside is that it flowers for such a short time.