Are your looking for an alternative growing medium for your plants than soil? This Grit Mixture is the perfect alternative. It contains all natural products (lava rock, pumice and zeolite) for an optimal aeration of the roots and water- and nutrients retention. Then again the absorbed water and nutrients are released slowly, just when the plants desires. It gives your plants a healthy root system and a stable and strong medium. The Grit Mixture can be used for any type of plant, small or large.