Iron Sulfate Fertilizers

Iron Sulfate for Grower Nutrient Programs

Iron sulfate, also called ferrous sulfate, supplies iron for plant nutrient programs. Compare products by iron concentration, physical form and package size to select the material that fits your application.

Heptahydrate: 20% Iron

Our water-soluble iron sulfate heptahydrate powder is offered in 8 oz, 1 lb, 4 lb and 50 lb packages for fertigation and hydroponic nutrient formulation. The smaller containers provide options for lower-volume nutrient preparation, while the 50 lb bag serves bulk requirements. This untreated material may cake over time.

Monohydrate: 30% Iron

For a more concentrated granular iron source, compare Twinsbridge Ferrous Sulfate Monohydrate, 55 lb and Diamond Brand Ferrous Sulfate Monohydrate, 50 lb. Both product listings specify 30% iron and 18% sulfur. Review each product's technical specifications and application guidance before choosing a material.

Choosing the Right Product

Calculate nutrient additions using the analysis of the specific product. Do not substitute equal product weights of 20% iron heptahydrate and 30% iron monohydrate. For Hi-Yield Iron Sulfate (Copperas), follow its package label for use in preventing and correcting iron-deficiency chlorosis.

Yellowing foliage can have several causes. Use soil, growing-media or tissue testing when appropriate, and follow product-specific directions rather than a universal application rate. Iron sulfate is an iron source, not a complete fertilizer program.