Espoma Organic Plant-Tone All-Natural Plant Food, 5-3-3 Formula, 36 lbs. is an all-natural and all-purpose plant food that can be used on flowers, vegetables, trees, and shrubs. It contains Bio-tone, a proprietary blend of beneficial microbes that biologically enhances the natural plant food to ensure superior plant growth. This plant food won't burn or leach away and does not contain any sludges, hazardous, or toxic ingredients. It is also enhanced with Bio-tone microbes for optimum growth and blooms and is environmentally friendly.