I planted my JC climber about 5 yrs ago. It is not achieving the height I'd like in its sunny location. It's only about 5 1/2 ft tall. Blooming is very very profuse initially but then black spot usually appears and resulting blooms are very very few and the foliage is no longer pretty. I do love it there so not looking to necessarily move it at this moment but...wondering if I could prune it into a small tree type form? It has one very strong woody leader. Let me know - thanks!