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Year-round vegetables, minimal resources, climate-resistant—we’ve sung praises about vertical farms many times before. But Singapore’s Sky Greens is something very special.

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Sky Greens’ four-story rotating greenhouse produces 1 ton of leafy greens every other day using a hydraulic-driven system that rotates and provides sunlight for the growing troughs. Photo credit: Sky Greens

Designed by engineer and entrepreneur Jack Ng, Sky Farms runs on a so-called Sky Urban Vertical Farming System and is also heralded as “the world’s first low-carbon hydraulic driven urban vertical farm.”

What does that mean? Well, for such a modern and innovative idea, Sky Greens actually uses good ol’ fashioned rainwater and gravity. Using a water-pulley system, 38 growing troughs rotate around an A-shaped aluminum tower that’s about 9 meters (about 30 feet) tall. The rotating troughs ensure even distribution of natural sunlight for each plant.

Not only that, the same water used to turn the troughs also nourishes the plants. According to the company, “With the plants irrigated and fertilized using a flooding method, there is no need for a sprinkler system thereby eliminating electricity wastage, as well as water wastage due to run-offs.”

“Only 0.5 liters of water is required to rotate the 1.7 ton vertical structure,” the company boasts. “The water is contained in a enclosed underground reservoir system and is recycled and reused.” Additionally, only 40W electricity, or the equivalent of one light bulb, is needed to power a single 9 meter tower.

The farm consists of 1,000 vertical towers and produces 800 kilograms of Chinese cabbage, spinach, kai lan and other greens everyday for the bustling Southeast Asian metropolis, according to The Straits Times. The farm has been producing vegetables commercially since 2012.

Check out the image below to see how it works.

Sky Greens’ vegetables do cost slightly more than fare from traditional farms. “A 200g packet of Sky Greens xiao bai cai costs $1.25, while a 250g bag of Pasar brand xiao bai cai from a traditional farm in Singapore costs 80 cents,” The Straits Times reported.

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