Hi-Yield Iron Sulfate 3.25 lb

Recommended for the prevention and correction of chlorosis (yellowing of plant leaves) caused by iron deficiency. Aids in creating an acid soil condition. 

3.25 lbs. covers 875 square feet.

Application Rates (the linked label also says lawn-only while listing tree/shrub directions; confirm the actual package and intended site before use):

• Trees: 1/2 lb. per inch of trunk. Apply around drip line. 
•  Shrubs: 1 lb. per 2 ft. of height.
• Caution: Will stain concrete and pavement! Not intended or recommended for container-grown plants.

*formerly Copperas