My knockout roses are not blooming properly
My double knockout rose plant had large beautiful blooms when I first bought it. After I planted and fertilized them (with a rose fertilizer) I was expecting the next flush of blooms to be as good as the original ones when I bought the plant. Unfortunately the "double" knockout roses looked like single knockouts and a size smaller ! and some of them did not bloom properly or were deformed. The plant itself looks good with nice foliage and is sprouting pretty well. Can't say the same for the roses. I fertilize every week alternating between a rose fertilizer and a bloom booster (with high phosphorus content). The drainage is very good, gets watered regularly, gets > 6 hrs sunlight. What am I doing wrong ?? any advice you may give is highly appreciated.