Hmmm. I've never had a potted rose bush that did not do well. I moved from growing Hybrid Teas and Floribundas to growing David Austin Shrub roses, which are much bushier and fuller.
They fill out a pot very nicely. I 'doctor up' my potting soil quite a bit before planting the rose ----
I use Rose Tone, alfalfa meal, bone meal and compost to the potting soil, in addition to using
Mycorrhizal fungi, to help establish the roses root system.
