They are eco-friendly and will not deteriorate or break down. They can be used both indoors and outdoors. PERFECT PLANTERS: Our pea gravel pebbles can be both functional and decorative for plants. Use the mini rocks to line pots and planters or mix in with soil. This will allow your plants to effectively drain water. Once you have potted your plant, these stones will look great as a decoration, but will also keep away pests such as gnats. These can be used in outdoor and indoor plants. Use them for potted succulents, cacti, aloe vera, umbrella plants and bonsai trees. WATER/GARDEN FEATURE: These pebble stones can be used in aquariums as decoration. However, we recommend double-checking the effect of this type of rock on your flora, fauna, fungi and aquatic life in your tank before using them. We recommend washing them and soaking them thoroughly before use. Brush them with soap and rinse well. Let the stones dry before use. Use them in water features or ponds in your garden. Decorate