Iron deficiency results in pale yellow leaves, poor growth and flowering, and is the main reason why rhododendrons, heathers and other lime-haters cannot be grown well on chalky or alkaline soils. Vitax Sequestered Iron Plant Tonic supplies the necessary iron, together with magnesium and manganese, in a form plants can use to correct the deficiency.Apply in early Spring to rhododendrons, azaleas, camellias, magnolias, roses, hydrangeas, currants, soft fruit and herbaceous perennials.Makes up to 18 litres (4 gallons) of feed.