Kerex Super Iron Chelate is a special additive for treating all plants and shrubs and is packaged in a 1.75 lb. shaker canister. Kerex special chelating agents allow the soluble iron to remain free and available for plant consumption during the entire growing cycle. Kerex feedings help to overcome chlorosis and the dreaded "yellow leaf" appearance that comes from a lack of iron and other key nutrients. Kerex is especially effective for use on all types of plants that are grown in the harsh alkaline soils of the western United States. Kerex boosts plant vigor and produces rich, dark green leaves when used as directed.