Vertical farming

 

It's a way of growing food that turns traditional agriculture on its head. With the required technologies now rapidly maturing, vertical farming is sprouting across the globe. While there are still unresolved issues with this marriage of technology and agriculture, its promise may be irresistible. If it gets off the ground — literally — in a major way, it could solve the problem of feeding the Earth's 7.9 billion people. And that's just one of the benefits its proponents promise.

What is vertical farming?

Vertical farming is a form of agriculture that grows plants indoors in floor-to-ceiling, tower-like walls of plant-holding cells. Instead of growing plants in horizontal fields on the ground, as in traditional farming, you can think of vertical farming's "fields" as standing on edge and extending upward toward the ceiling. The plants need no soil or other aggregate medium in which to grow; their roots are typically held in a cell lining, often composed of coconut fiber.

Vertical flora is grown either aeroponically, in which water and nutrients are delivered to plants via misting, or hydroponically, in which plants are grown in nutrient-rich water. These are incredibly efficient systems, requiring 95% less irrigation than soil-grown plants. With vertical farming, Storey says that 99 percent of the moisture transpired by plants can be recaptured, condensed, and recirculated. Plants, of course, also need light to grow, and vertical farms use increasingly efficient LED bulbs to keep plants thriving.

The history of vertical farming

The idea of vertical farming isn't new, and experts have been questioning its viability since the term was first coined in 1915 by Gilbert Ellis Bailey, who was obviously way ahead of the available technology at the time. The first attempt to grow produce in a constructed environment was a Danish farmhouse factory that was built to grow cress, a peppery green related to mustard, in the 1950s.

The modern concept of a vertical farm arose in the New York classroom of Columbia University's Dickson Despommier in 1999. He presented the idea as a theoretical construct, a mental/mathematical exercise imagining how to farm in an environmentally sound manner. His class began with the notion of a rooftop garden before considering a "high-rise" version that might theoretically be able to grow enough rice to feed two percent of Manhattan's population at the time. The eureka moment was a question Dispommier asked: "If it can't be done using rooftops, why don't we just grow the crops inside the buildings? We already know how to cultivate and water plants indoors." With the technological advances of the last few decades, vertical farming is now a reality. 

The economics of vertical farming

Building and operating a vertical farm is a costly endeavor, requiring a substantial initial investment in state-of-the-art technology, real estate, and construction. AgFunderNews (AFN) estimates that it can cost $15 million to construct a modern vertical farm. Fortunately, investors see the potential in vertical farming, and the industry has attracted more than $1 billion in investments since 2015. That includes $100 million for Aerofarms. Plenty, Inc raised $200 million in 2017 from a fund backed by such respected forward-thinkers as Jeff Bezos and Alphabet chairman Eric Schmidt.

AFN is particularly excited by the potential of what they call second-generation vertical farming technology. They cite advances in LED technology — expected to increase energy efficiency by 70 percent by 2030 — and increasingly sophisticated automation that can streamline the operation of vertical farms. AFN anticipates operating cost reduction of 12 percent due to improvements in lighting and another 20 percent from advances in automation. BusinessWire says that the vertical farming produce market was valued at nearly $240 million in 2019, and they expect it to grow 20 percent annually to over $1 billion by 2027.

 Vertical farming today

 Today, growers across the globe are developing vertical farms. While the U.S. has more vertical farms than any other country, the industry is blooming everywhere. There are currently over 2,000 vertical farms in the U.S. While more than 60 percent of these are owned by small growers, there are a few heavyweights as well. In addition to Wyoming's Plenty, Inc. and Newark's Aerofarms, there's also New York's Bowery Farming. There are also companies such as edengreen, based in Texas, whose mission is to help new entrants construct and operate vertical farms.

Japan comes in second, with about 200 vertical farms currently in operation. The largest vertical farming company there is SPREAD. Across Asia, vertical farms are operating in China, South Korea, Singapore, Thailand, and Taiwan. In Europe, vertical growers are in Germany, France, Netherlands, and the U.K. Germany is also home to the Association for Vertical Farming, "the leading global, non-profit organization that enables international exchange and cooperation in order to accelerate the development of the indoor/vertical farming industry."

In the Middle East, whose desert land and scarcity of water present a particularly challenging agricultural environment, vertical farming is taking root, so to speak. The United Arab Emirates' Badia Farms is now producing more than 3,500 kilograms of high-quality produce each day and expects to increase that yield going forward. In Kuwait, NOX Management launched in the summer of 2020 with plans to produce 250 types of greens, with a daily output of 550 kg of salads, herbs, and cresses.