Hi Kousa: do you happen to use any fertilizer on your Blonde Vision? If so what is the NPK ratio?
I have had similar issues on many unrelated cultivars in the past and the cause was always too much nitrogen in the ground. I have solved the problem by not fertilizing for one year and applying a softwood mulch to get rid of the excess nitrogen and if next year I am still around I will try and fertilize them with Thomas' slag (an ancient nitrogen-free fertilizer very much beloved by rose growers, now out of production but I still have three quarters of a bag).
