Clay, Stone & Other Media
These hydroponic media consist of pebble-sized mineral deposits which offer superior drainage and aeration compared to other substrates. Being loose-fill media, these products take a lot of the hassle out of transplanting, and they will protect your garden against weeds and other problematic pests that can take root unseen in other media, so you can be relatively sure that your plants are the only thing growing in your garden. While often more expensive than other grow substrates, these media have the added benefit of being highly reusable.