Sealed Crop Boxes Redefining Vertical Farming

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PLANTX has developed a fully sealed system that controls light, air, and water to produce vegetables and fruit indoors. The technology is drawing attention not only for its ability to deliver consistent crop quality and yields regardless of climate conditions, but also for its potential to enhance flavor and nutritional value.

The Tokyo-based startup sees its system as a serious answer to global food security challenges, and is now setting its sights on international markets.

PLANTX's plant research laboratory sits inside an office building a short walk from Kawasaki Station. Step through the door and you're greeted by rows of white, box-like units lined up across the room. These are the company's fully sealed cultivation devices, which it claims are the first of their kind in the world.

Each unit precisely controls 28 environmental parameters, including light intensity, day-night cycles, temperature, CO₂ concentration, airflow speed, and the ionic concentration and flow rate of nutrient solutions, all working together to regulate plant growth.

For lettuce alone, the system has driven more than a sixfold increase in productivity over the past decade up to last year. It also carries meaningful environmental benefits, producing 100 grams of lettuce uses 12 liters less water than conventional farming methods.

Multiple units can be combined to build what are known as plant factories, and PLANTX supports client companies through the entire process of planning, setting up, and running these facilities.

'Cultivation Recipes'

Beyond selling these equipment, the company has built a notable second revenue stream: distributing tailored "cultivation recipes." At the Kawasaki facility, 40 units are dedicated to developing these recipes, which can replicate the flavor profiles of vegetables from specific regions or boost the concentration of particular nutrients.

Because everything happens in a pesticide-free, hygienically controlled environment, the produce can be eaten without washing and stays fresh longer than conventionally grown alternatives. PLANTX's clients use the system to supply fresh vegetables directly to well-known restaurants and supermarkets.

One key challenge ahead is expanding the range of crops the system can grow. Profitability currently depends largely on leafy vegetables with high edible yields, such as lettuce, arugula, and basil. That said, the research facility is already working on strawberries, cherry tomatoes, cucumbers, and wheat.

Research is also advancing on domestically producing medicinal plants and reliably supplying high-quality pharmaceutical compounds. In one notable collaboration with Rohto Pharmaceutical and the National Institutes of Biomedical Innovation, Health and Nutrition, PLANTX is working toward commercializing hydroponic cultivation of Panax ginseng.

Global Ambitions

This kind of technology-driven food production falls under the broad umbrella of food tech, a field where startups around the world are competing fiercely.

PLANTX CEO Kosuke Yamada is clear about what's at stake: "Food tech has the potential to become a global industry. If Japan can lead the world with its technology, it can also contribute to economic growth."

The Japanese government has set a national milestone of capturing a 30% share of the global and domestic plant factory market by 2040, a goal that aligns closely with PLANTX's own vision.

Last December, Kubota installed PLANTX's sealed cultivation system at its marketing base in New York—a first step toward gauging demand for plant factories in North America and testing viable business models.

The New York market serves as the bridgehead for broader ambitions. The company aims to expand from there into Europe, the Middle East, and Asia, and Yamada expressed hope that the technology could eventually reach regions facing severe food shortages, including parts of Africa and island nations.

Yet the plant factory industry remains far from mature. "We still don't fully understand which plants are truly suitable," Yamada said. "What we've achieved so far is just the tip of the iceberg." He stressed the urgency of pressing ahead with research and development.

Food tech has been designated one of 17 strategic sectors under Prime Minister Sanae Takaichi's administration, lending the field significant political weight. "This is both a business opportunity and a means of achieving food security," Yamada said. For PLANTX, a new phase is only just beginning.

Author: Aya Yonezawa, The Sankei Shimbun

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