LECA Clay Balls
Leca stands for Lightweight Expanded Clay Aggregate. Manufacturers produce Leca balls by heating clay in a rotary kiln at high temperatures, causing the clay to expand and form round pellets. These small, lightweight, and porous clay pellets find common use in gardening and hydroponic systems.
Their porous structure facilitates excellent aeration and water retention in soil or hydroponic setups, fostering healthy root growth. People often favor them for terrariums and as a medium for orchids or other plants that need ample aeration around their roots.”