J Arthur Bower’s John Innes No 3 compost is a best quality loam based compost. John Innes No 3 compost is a potting compost for the home and vegetable garden. The soil base has nutrients and trace elements for plant growth. Peat moss increases water retention and air circulation and is balanced with lime-free grit sand to improve drainage. J Arthur Bower’s John Innes No 3 compost has added lime. NPK nutrients boost leaf, root and flower growth.