Q: I am sending two photos of my desert willow tree, now in its fourth spring. The buds form, grow and then dry out before opening. Have taken samples to Mesquite Valley Growers. They see no evidence of pests or disease, and recommended more water and fertilizer. The leaves seem smaller and shorter than others I see.
A: I agree with Mesquite Valley Growers; the symptoms you describe are likely related to insufficient watering. The recommended schedule for desert trees is once every two to three weeks in the spring, summer, and fall to a depth of 24 to 36 inches. An annual spring fertilizer application wouldn’t hurt either, making sure the fertilizer is watered in to reach the absorbing roots.
Peter L. Warren is the urban horticulture agent for the Pima County Cooperative Extension and the University of Arizona. Questions may be emailed to tucsongardensage@gmail.com
