An olla is an unglazed clay pot buried in the soil with its neck above ground, filled with water to irrigate plants slowly and efficiently. Water seeps through the porous clay directly to plant roots, driven by soil moisture tension, so plants get water only when needed, preventing overwatering and evaporation loss.

Ollas save 60-70% of water compared to conventional watering methods, reduce surface irrigation that promotes weeds, encourage strong root growth, and maintain consistent soil moisture which improves plant health and yield. They are especially beneficial in dry or arid climates and for container or raised bed gardens