This Bosmere English Garden Compressed Coco Brick Premium Soil Amendment (4-Pack) is an excellent growing medium that is a great alternative to peat. It has a high water holding capacity, is lightweight, has good aeration and is 100% natural. Each compressed brick will make 2.5 Gal. of growing medium. Just add water to expand the brick.Premium growing medium that is an excellent alternative to peat100% natural and made from renewable resourcesHigh water holding capacityLightweight with great aeration for healthy root systemsEach brick will make 2.5 dry gallons of premium growing medium4-pack