Sequestrene cures iron deficiency in acid loving plants & helps all plants grow better. Granular formulation with slow release, one application lasts all season. Sequestrene granules should be scattered around the base of trees & shrubs, particularly beneficial to ericaceous plants such as rhododendrons, heathers, azaleas, camellias, pieris, enkianthus, blueberries etc. Pack size 5 sachets makes a total of 5 gallons. Contains chellated iron