Hydroculture is the growing of plants in a soiless medium. In place of soil, an expanded clay aggregate is used. The aggregate clay has been formed into small balls and heated to 1200 degrees Celsius. Heating partially seals the outer layer of the clay, allowing moisture to penetrate.
The clay material is placed in a molded one-piece container with no drainage holes. Container size may vary from small to very large. As plants grow in this soiless medium, their roots attach themselves to the clay and absorb the correct amount of moisture needed.
Fountain rocks are often added as the centerpiece of water garden containers. These are usually made of volcanic rock that has been carved to include shapes like a cascade or a Bonsai cavity. Under the rock is a small, noiseless electric motor that creates a waterfall. Plants are arranged in the clay aggregate around the rock centerpiece and in the cavities of the rock itself. Any plant you like will grow in this medium, whether from a garden or the local nursery. The resulting indoor water garden is beautiful and its cascading sound is a great addition.
Chad Rockett, Smith County Master Gardener
Texas Cooperative Extension
Landscape Index
Gardening Tips For NorthEast Texas Index
East Texas Piney Woods Gardening Home Page