Perfect for any type of growing one brick is enough to grow on 70 plants when used in conjunction with the grow on trays we supply coir is the outside layer of the husk that surrounds the shells of coconuts simply break the brick down and add water to produce 9 litres of superb peat free compost this brick of compressed coir compost is environmentally friendly and from a sustainable source this compost is ideal for any potting up or growing on