Certified Organic Iron-tone® 2-1-3 For preventing iron chlorosis • Iron tone is an all natural iron supplement • Provides 5 percent iron and 13 percent sulfur • Restores deep green color to yellow chlorotic plants • Will not stain patios or walkways For Use On: Flowers, Vegetables, Evergreen & Ornamental Shrubs, Berries, Citrus, Shade, Ornamental & Fruit Trees. When to Use: Apply in Early Spring or anytime in the growing season where iron chlorosis (yellowing leaves) is noticed.