This potting mix is specifically made for arid plants. It's made with a blend of organic compost, kelp, pine bark, fungi, diatomaceous earth, sphagnum peat moss, and cypress sawdust. They are in two-quart resealable bags and each bag is the perfect amount for planters up to 5 inches in diameter. For larger planters up to 7 inches in diameter, we recommend using two bags.