Pumice is widely used in all Bonsai, Succulent, Cactus, and many other specialty plants soil mix. Helps soil retain moisture, promote healthy roots so your plants can thrive. Great as a soil additive,perfect Grow Medium for all horticulteral applications. Clay naturally has balanced capillary action,any hydroponics/aeroponics. If you have any questions, feel free to contact us! If you have any questions, feel free to contact us!