Glazed Cove Water Cacti in Misty Blue, 450mlOffering a consistent and dependable source of hydration for your indoor plants, Bergs Potters Cove range draws inspiration from both the elegant shape and the natural water retention abilities of the cereus cacti. Easy to use, partially bury in the soil of either a medium or large sized potted plant, fill with water, and simply let it seep down to the roots.