Cities need green spaces to combat pollution, heat, and climate change, yet water scarcity makes upkeep difficult. Traditional irrigation wastes water, leading many cities to limit natural grass use. A breakthrough solution—Capillary Hydroponics—offers a way forward. This sub-surface irrigation system delivers water directly to the root zone, cutting usage by up to 85% while growing stronger, more resilient turf. Unlike conventional methods, it minimizes evaporation, prevents overwatering, and thrives even in extreme climates. Helsingborg, Sweden, proves this works. Since 2021, the city has maintained a high-traffic public park with minimal water and upkeep. This success sets a model for cities worldwide, proving that sustainable, green urban spaces are possible.