Water several times a week throughout the summer, except when your region gets heavy rain. Water deeply from the base of the plants and allow the ground to dry out before you water again. Use compost or a balanced, all-purpose fertilizer each year in the spring. Depending on your soil conditions, you may want to fertilize them again when the flowers first begin to open. to increase flowering and air circulation. Cut off some of the oldest, largest branches as close to the ground as possible at the end of winter or after flowering in late spring. Take branches from different areas, including the center, to open the bush up where needed. Never remove more than 1/3 of the branches at any one time.  Remove diseased or damaged branches and suckers sprouting up from the base as soon as you discover them. Cut off dead flowers to prevent the plant from putting resources into forming seeds. Prune the bush again in the fall after flowering is done to shape it or remove branches with low flower production.

How would you rephrase that briefly using Chinese?
勤浇水。 春季要施肥。 勤修枝以促进开花及空气流通。