Robots take vertical farming to new heights

A decades-long decline of industry in Braddock has left the western Pennsylvania town in ruins. Ten miles upriver from Pittsburgh in the Mon (Monongahela) Valley, most of the city's factories, businesses and homes were abandoned long ago and leveled. Among the ruins, a sprawling steel mill, built by Andrew Carnegie in 1874, is still producing slabs of steel, 24 hours a day, seven days a week. It's stained blue walls and maze of giant, rust-colored pipes and vents stand in contrast to the brand-new, block-long, gleaming white structure directly across the street. The mill's neighbor is Fifth Season, a vertical farm growing greens indoors by stacking racks of plants on top of each other.

Fifth Season is the brainchild of brothers Austin and Brac Webb, and co-founder Austin Lawrence. "We view vertical farming as really a smart manufacturing system," says Austin Webb. "We just happen to manufacture living organisms."

The partners consider their fledgling enterprise as more than a means to feed people, but also a chance to work with a community in need. Almost none of the old steel plant's employees live in Braddock. Conversely, everyone hired to work at Fifth Season lives close by and in the surrounding communities. "We're creating a workforce of the future," Webb says. "It's an entirely new ag-manufacturing job that hasn't existed before."

Two shifts of 20 people oversee operations at the vertical farm. And like the steel maker across the road, the work never stops. Dressed in blue scrubs and lab coats, with heads covered and gloves on their hands, workers inside the plant look more like medical research professionals than farmers. The entire process, from seed to harvest, is controlled robotically. "What we have built is the industry first, and industry only, end-to-end automated platform," says Webb.

Fifth Season's proprietary software allows efficiencies otherwise not attainable. Spinach, arugula and other greens move around the 60,000-square-foot facility in plastic trays, each with its own unique ID. Sensors are constantly monitoring everything from nutrient mix, carbon dioxide levels and light spectrum, in order to ensure that the greens follow their prescribed grow recipe. Every plant can be traced from any point in the process, at any time.

Webb is quick to tout the advantages of vertical farming. Fifth Season uses up to 95 percent less water and 98 percent less land than conventional farming. Water from the municipal system is filtered and proprietary nutrients added before getting to the plants directly through their roots. "It means you can replicate any form of soil environment," he says. Whatever water is not used by the plants is retreated and recirculated, with nutrients added as needed. A peat mix is used to support the roots, but all the nutrients are in the water, not the "soil."

"We use no herbicides and no pesticides," Webb says. "And that's because we have hermetically sealed environments." The possibility of contamination is all but eliminated. Fifth Season recently received a perfect score from the Safe Quality Food (SQF) program, an international, independent body that certifies food safety management. "The second time in 25 years they gave 100 percent," he says.


With only their faces exposed, employees work among the various conveyor belts that crisscross the high, white-walled rooms of Fifth Season's production floor. But there are no humans in the adjacent grow room, where tightly spaced racks, supporting trays of plants, are stacked 30 feet high, bathed in an otherworldly purple-magenta glow. The dramatic color comes from the LEDs that replicate the most useful parts of the spectrum of sunlight. "You can't control the sun," Says Webb. "But what you can control are LEDs."

Fifth Season's proprietary systems allow more plants to be grown in less space. The purple-magenta LED lighting replicates the most useful parts of the spectrum of sunlight, improving growth of the greens.

(Fifth Season)

Every few minutes, a robot glides forward and back along a raised guideway that runs down the center of the room, dividing the stacks in half. The machine is not much more than a plain box, just a few feet tall. A metal beam rises from its back, extending to the ceiling. Its task is to place and remove trays of plants, taking its instructions from the all-knowing software. Because they are so tightly spaced, more trays can be stacked on top of each other, resulting in greater production.

"Compared to some other vertical farms out there, we have a lot more density," says Webb. "We're able to have more racks that grow inside the same space." Moving trays is a task well-suited to a machine. Not only does the robot fit into places no human could, it always knows where every tray of greens should be, and for how long.

Vertical Farming Comes to Braddock

After a five-year career in finance, Austin Webb enrolled in an MBA program at Carnegie Mellon University in Pittsburgh. "I believe that robotics will possibly disrupt every industry in the world," he says. "And so I went to C.M.U., specifically because it's the No. 1 school in computers, science and robotics."

There he met Austin Lawrence, who shared his interest in controlled environment agriculture. Together they visited a few vertical farms, coming to the conclusion that what was needed was an entire robotic platform, something the two of them could not accomplish on their own. Webb's brother Brac, a self-described engineer and entrepreneur, was soon recruited to help. Their new business was incorporated in 2016, initially as RoBotany, which later morphed into Fifth Season.

With financial backing in hand, the partners looked for a place to build, quickly settling on nearby Braddock. They broke ground in May of 2019, were installing equipment less than a year later and were at full production before the end of 2020. "I think there's a lot of opportunity for resurgence in a place like this," says Webb. "A lot of folks that stayed are passionate around Braddock being able to grow and thrive and we want to be a part of that."

Click here to read the complete article.

Header Photo: Greens leave the grow room at robot farm Fifth Season, ready for harvest. (Courtesy of Fifth Season)

Source: Governing