Espoma 18 lb. 5-2-6 Citrus-Tone All-Natural Citrus Food. It is specially formulated for all citrus, fruit, and nut trees, including avocado. This premium plant food contains natural organic ingredients to meet the unique nutritional needs of these plants. Enhanced with Bio-Tone, our proprietary blend of beneficial microbes, Citrus-Tone biologically enhances the natural plant food for superior growth. It feeds slowly, providing a long-lasting food reservoir for sustained results. Environmentally friendly and free from sludges, hazardous, or toxic ingredients, Citrus-Tone won't burn or leach away.