Mosser Lee Black Polished Stones make an attractive soil cover for indoor and outdoor container plants, including bonsai, cacti and others. Beautify and enhance your plants by adding a decorative top layer of Polished Stones to your planters and pots. Polished Stones are also ideal for terrariums, aquariums, water and dish gardens, fountains, clear vases and various craft and decorative projects. The number of uses for these stones is only limited by your imagination.