Pebble mulch in interior or exterior garden beds Can be used for indoors and outdoors, safe for aquariums Perfect for Plant and Vase Arrangements, Dish Gardens, and Terrariums Use indoors or outdoors Available in mixed color The natural polished mixed stones come in a multitude of colors. The stones are safe to use inside and outside. It could also be used as an accent to aquariums, water gardens, ponds, and terrariums. This river rock soil cover adds a final touch of beauty and protection to all potted plant terrariums and indoor gardens. Protects soil and retains moisture. Adds color texture and variety to houseplants