Water Deeply and Infrequently, and Focus on the Roots: Instead of frequent, shallow watering, water your orange roses deeply and thoroughly. This encourages the roots to grow downwards, creating a stronger and more resilient plant. Allow the topsoil to dry out between waterings. When you do water, aim for the base of the plant to keep the foliage dry, which also helps prevent diseases. The amount of water will depend on your climate and soil type, but a general guideline is 1-2 inches of water per week.