Our John Innes Peat Free Ericaceous compost is a rich mix of loam, bio-fibres and horticultural grit with added nutrients providing the perfect structure for plant roots and maximum green leafing. Our Ericaceous mix has a pH level of 4.0 which is perfect for growing calcifuges (lime hating plants) such as rhododendrons, azaleas, camellias and blueberries.