Vertical farming and the food crisis: what the technology can and cannot do

01How vertical farming works

Vertical farming is the practice of growing crops in vertically and horizontally stacked layers. It often incorporates controlled-environment agriculture, which aims to optimize plant growth, and soilless farming techniques such as hydroponics, aquaponics, and aeroponics. Some common choices of structures to house vertical farming systems include buildings, shipping containers, underground tunnels, and abandoned mine shafts.

The core concept is straightforward: instead of spreading crops across horizontal fields, stack them vertically in a controlled indoor environment. Plants grow on trays arranged in layers, with LED lights providing the exact spectrum and intensity of light needed for photosynthesis. Nutrient-rich water is delivered through hydroponic or aeroponic systems, eliminating soil and dramatically reducing water consumption.

The controlled environment allows precise regulation of temperature, humidity, carbon dioxide levels, and light cycles. This means crops can be grown year-round regardless of external weather conditions, and growth rates can be significantly faster than in open fields. Some vertical farms report harvest cycles of 15-20 days for leafy greens, compared to 45-60 days in traditional agriculture.

02The energy and cost challenge

The most significant barrier to vertical farming is energy. Replacing sunlight with artificial lighting requires enormous amounts of electricity. A vertical farm can consume 30 to 40 times more energy per kilogram of produce than traditional field agriculture. Even with the most efficient LED grow lights available, the energy cost remains the dominant expense for most operations.

This energy intensity means that the economics of vertical farming are highly sensitive to electricity prices. In regions with cheap, clean electricity, such as areas with abundant hydropower or solar, vertical farming can be more viable. In regions with expensive or carbon-intensive electricity, the cost and environmental footprint of vertical farming can exceed that of imported produce.

Capital costs are also substantial. Building out a vertical farm with climate control, lighting, irrigation, and automation systems requires significant upfront investment. These costs must be amortized over the production volume, which for leafy greens is relatively low in terms of market value per unit weight. High-value crops alone may not generate sufficient revenue to cover the capital and operational costs.

03What crops work and what do not

Vertical farming is currently viable for a narrow range of crops, primarily leafy greens and herbs. Lettuce, kale, spinach, arugula, basil, and mint are the staples of the industry. These crops have short growth cycles, high value per unit weight, and low caloric density, making the economics of indoor production more favorable.

Caloric staples like wheat, rice, corn, and soybeans are completely impractical for vertical farming. These crops require large amounts of space, have long growth cycles, and generate low revenue per square meter. The energy cost of growing wheat indoors has been estimated at hundreds of times the cost of field-grown wheat. Root vegetables like potatoes and carrots are similarly unsuitable, as their growth habits do not lend themselves to stacked tray systems.

Some companies are experimenting with vine crops like tomatoes, strawberries, and peppers in vertical systems, but these present challenges in terms of structural support, pollination, and space efficiency. The most promising expansion beyond leafy greens is in pharmaceutical and specialty crops, where the high value per unit can justify the increased production cost.

04Water efficiency compared to traditional farming

One area where vertical farming has a clear advantage is water efficiency. Traditional agriculture is the largest consumer of freshwater globally, with irrigation accounting for approximately 70 percent of global freshwater use. Much of this water is lost to evaporation, runoff, and inefficient distribution.

Controlled-environment agriculture (CEA) -- which includes indoor agriculture (IA) and vertical farming— consists of crop production systems in greenhouses or other structures that use horticulture and engineering techniques beyond conventional soil-based outdoor production. These systems may increase yields, improve access to local foods, provide year-round food access and improve nutritional outcomes relative to traditional large scale farming. The aim of CEA is to provide protection from the outdoor elements and maintain optimal growing conditions throughout the development of the crop. Production takes place within an enclosed growing structure such as a mushroom farm, greenhouse or plant factory. CEA based greenhouses are very common although vertical farming has struggled financially. Some methods of harvesting like cut-and-come again can be profitable for high value crops like greens in vertical farms.

Vertical farms using aeroponic systems can reduce water consumption by up to 95 percent compared to field agriculture for the same crops. The closed-loop systems recapture and reuse water, with losses limited to transpiration through plant leaves. In a world facing increasing water scarcity, this efficiency is a genuine advantage, particularly in arid regions where traditional farming is becoming unsustainable.

05Urban agriculture and food security

Urban agriculture (UA) refers to various practices of cultivating, processing, and distributing food in urban areas. The term also applies to the area activities of animal husbandry, aquaculture, beekeeping, and horticulture in an urban context. Urban agriculture is distinguished from peri-urban agriculture, which takes place in rural areas at the edge of suburbs. In many urban areas, efforts to expand agriculture also require addressing legacy soil contamination, particularly from lead and other heavy metals, which can pose risks to human health and food safety.

Vertical farming positioned in or near urban centers can reduce the distance food travels from farm to consumer, potentially lowering transportation emissions and improving freshness. For perishable crops like leafy greens, which have a short shelf life, proximity to market is a genuine advantage. Urban vertical farms can harvest and deliver produce within hours, compared to days or weeks for field-grown produce transported from distant growing regions.

The food security argument for vertical farming is more nuanced. While indoor production is insulated from droughts, floods, and seasonal variations, it is entirely dependent on the electrical grid. A power outage in a vertical farm can destroy an entire crop within hours. True food security requires diversity of production methods, not a single technological solution.

For regions that import most of their fresh produce, such as the Middle East, Singapore, and Arctic communities, vertical farming offers a pathway to reduced import dependence. Several governments are subsidizing vertical farming as a matter of national food security strategy, though the cost per unit of food security achieved is high compared to other approaches.

06The business model problem

The vertical farming industry has experienced a wave of high-profile failures. Several well-funded companies, including AeroFarms, AppHarvest, and Kalera, filed for bankruptcy or underwent major restructuring in 2023-2024. The pattern is consistent: companies raise significant capital on growth promises, build expensive facilities, and discover that unit economics do not work at current energy prices and produce market values.

The fundamental issue is that vertical farming competes with field-grown produce on price, and the cost gap is large. A head of lettuce grown in a vertical farm costs significantly more to produce than one grown in open fields, even accounting for transportation. Consumers have shown limited willingness to pay a premium for vertically farmed produce, particularly when the quality difference is not easily perceived.

Some companies are pivoting toward business-to-business models, supplying restaurants, food service companies, and processed food manufacturers who value consistency and local sourcing. Others are focusing on technology licensing, selling their growing systems and software to other operators rather than growing produce themselves. Whether these models can achieve profitability remains to be seen.

07What the future of farming looks like

The future of farming is likely to be a hybrid model that draws on the strengths of multiple approaches. Traditional field agriculture will continue to dominate caloric crop production, benefiting from precision agriculture technologies that optimize inputs and reduce environmental impact. Controlled environment agriculture, including greenhouses and some vertical farming, will expand for high-value crops where the economics justify the investment.

Technology will increasingly integrate across these approaches. Sensors, drones, and AI-driven management systems are already being deployed in field agriculture to optimize irrigation, fertilizer use, and pest management. The data and automation expertise developed in vertical farming can be applied to improve efficiency in traditional agriculture as well.

For vertical farming specifically, the path forward depends on reducing energy costs. Advances in LED efficiency, integration with renewable energy, and potentially smaller-scale modular systems could improve the economics. But the fundamental constraint, that artificial lighting cannot compete with free sunlight for low-value crops, is unlikely to change. The technology will find its place in the agricultural ecosystem, but it will not replace the sun.