The best fertilizer for holly trees is an acid-based variety that includes nitric acid or cottonseed oil to keep the pH level down. Fertilize the holly tree in the late fall to give it a nutritious boost before the growing season; add a layer of compost to further fertilize the plant and enrich the soil with organic matter.
About the Author
Thomas K. Arnold is publisher and editorial director of "Home Media Magazine" and a regular contributor to "Variety." He is a former editorial writer for U-T San Diego. He also has written for "San Diego Magazine," "USA Today" and the Copley News Service. Arnold attended San Diego State University.