Give your mini-ponds and patio ponds a good start with the Mini-Pond Substrate from Velda. It ensures vigorous root development of marsh plants and, in the case of oxygen plants, beautiful leaf guirlands. Oxygen plants play an important role in the mini-pond environment, absorbing nutrients and providing oxygen-free and healthy water. The Mini-Pond Substrate is specially formulated for use as a bedding material, but also for planting marsh and oxygen plants.