Growmoor's John Innes No.3 compost is made from the 50 year old recipe of loam, peat and horticultural grit. This formula provides mature plants with a stockpile of nutrients for potting on and final potting of mature plants into large containers or pots. The unique properties of this compost is free draining and helps to prevent the roots becoming waterlogged and keeps porosity to allow plants to respire.