We moved into a new house a year ago. The side of the house was covered in ivy. We removed the ivy and revealed a large mature rose plant which had been completely obscured by the ivy probably for many years.. There was no sign of growth and it just looked like dead wood which we thought we would just cut down. Miraculously it sprouted dozens of healthy looking new branches and leaves but unfortunately no flowers or buds . What should we do to get the best chance of it blooming next year . Pruning , fertiliser ?