During the winter months, they will drop their leaves. In the spring, when the temperature warms up, new leaves will appear and the flower buds will grow. Don’t prune the branches in the spring – you will run the risk of cutting off the flower buds. Spring is a good time to fertilize with a granular, slow-release fertilizer with a high percentage of phosphorous. Phosphorous is the middle number in the NPK ratio and encourages flowering.
Thanks for writing!