Hydroton grow rocks, or expanded clay pellets, also referred to as LECA clay, clay balls, are one of the most helpful and versatile growing media to any traditional and hydroponic grower. They’ve gained popularity over the last few years for their porous shape. With these pores throughout each ball, the pellets make it to easy to support a steady distribution of nutrients, oxygen, and water around the roots of various plants. While the clay can be used on its own for growing plants, it can also be mixed with soil and other growing media. Hydroton is used widely in hydroponics and aquaponics.