Rainwater refills it, evaporation blocked via siphon. Most deserts get at least 150-250 liters of water per square meter per year, often much more. [1] The boxe

Rainwater refills it, evaporation blocked via siphon. Most deserts get at least 150-250 liters of water per square meter per year, often much more. [1] The boxes supply enough water for the roots to grow down to the capillary water below. [1] https://www.groasis.com/en/planting/what-is-capillary-water-in-the-ground https://www.groasis.com/en/planting/what-is-capillary-water-...