Seramis the ultimate in clay pebbles.
Sold by the litre so you can buy as much or as little as you need! Totally inert, pH neutral clay-based medium. Cuttings can be put straight into Seramis. 50% air space for maximum and healthy root growth. Cannot be over-watered due to perfect drainage. Irregular shape for stability in the pot. Perfect under corriboard. Wets easily and draws water up to 20cm height in 24 hours from dry. Lightweight - less than 0.4 kg per litre, 0.8 kg per litre fully wetted.