Garden in a Can make it fun and easy to grow organic herbs for months right from your windowsill. Special biochar technology inside helps prevent over-watering without messy drainage holes, saucers, transplanting, or chemicals in the soil. Just plant the included organic seeds, add water, and watch your herbs grow! THE MOISTURE-BALANCING BIOCHAR INSIDE is pretty incredible – it’s the charred remnants of organic agricultural waste (pyrolysis) – a technique mastered by the Amazonian tribes centuries ago. Biochar holds excess moisture to prevent over-watering, aerates the soil for quick root growth, and increases nutrient absorption in the soil.