Hydro Clay pebbles are substrate with units about the size of marbles or peanuts. Because they’re so lightweight, easy for transplanting and harvesting, and easy on the hands, they’re a favorite of small producers using media bed or Dutch bucket techniques. Clay pebbles are a growing medium that is most repeatedly used in hydroponic gardening. Though clay pebbles do not offer their own nutrients to plants, they provide a medium in which nutrients and water can effortlessly be added for healthy growing sequences. And is known for good colonization for microbial populations. However, clay balls for plants are extremely light weight and eco-friendly. The clay pebbles for plants are normally curved in shape, immensely durable and reusable.