Vertical farming is the practice of growing crops in stacked layers or vertical surfaces inside a controlled environment, rather than spreading them across open fields. These facilities can be purpose-built warehouses, repurposed shipping containers, or even walls inside existing buildings. The global vertical farming market was valued at roughly $9.6 billion in 2025 and is projected to grow at over 21% annually through 2035, reflecting how quickly the industry is scaling.
How Vertical Farms Are Set Up
The simplest way to picture a vertical farm is rows of growing trays stacked on top of each other, like shelves in a library, each lit by LED panels. This “stacked tray” design is the most common configuration. Plants sit in shallow trays, roots dangling into nutrient-rich water or mist, while artificial lighting overhead drives photosynthesis.
A less common but increasingly prominent approach is “true vertical” growing, where plants grow on tall towers oriented at roughly 90 degrees. Companies like Plenty use grow towers nearly two stories high with plants on both sides. The advantage here is airflow: horizontal trays trap heat between layers, which limits how intense the lighting can be. Since more light means more photosynthesis and higher yields, vertical towers can push productivity further by avoiding that heat ceiling.
Some operations skip the warehouse entirely. Modular shipping container farms offer a plug-and-play option: a self-contained growing environment inside a standard 40-foot container, complete with lighting, climate control, and irrigation. These are popular for smaller operators or remote locations where building a full facility isn’t practical.
Growing Without Soil
Most vertical farms use hydroponics, a method where plant roots grow in water enriched with dissolved nutrients, supported by an inert material like sand, gravel, or foam instead of soil. Because the water recirculates through the system, vertical farms can use up to 98% less water than traditional field agriculture.
Aeroponics takes this a step further by misting nutrient solution directly onto exposed roots, using even less water. Aquaponics combines fish farming with plant growing: fish waste provides nutrients for the plants, and the plants filter the water for the fish. Each method eliminates the need for soil entirely, which in turn eliminates the need for herbicides and dramatically reduces or removes the need for pesticides. In a sealed, climate-controlled environment, the pests and weeds that plague outdoor farming simply don’t get in.
The Role of LED Lighting
Lighting is the single most important technology in vertical farming, and also its biggest expense. LED panels replace sunlight, and the specific colors of light they emit matter enormously. Red and blue wavelengths are the most critical for photosynthesis and plant development. For crops like lettuce and basil, a ratio of about three parts red to one part blue light promotes the best growth.
But the story doesn’t end with red and blue. Green light penetrates deeper into the plant canopy than other wavelengths, reaching lower leaves that would otherwise be shaded. Far-red light, just beyond what the human eye can see, triggers a shade-avoidance response in plants that causes them to expand their canopy and produce more leaves. In one study, combining deep red and far-red supplementation at higher light intensity produced the highest results across nearly every growth metric in lettuce and basil, increasing fresh weight by 76% and 79% respectively compared to white light alone.
The lighting system accounts for roughly 70 to 78% of a vertical farm’s total electricity consumption. Getting the light recipe right for each crop isn’t just a matter of better produce. It’s the difference between a profitable operation and one that burns through cash on its electric bill.
What Vertical Farms Actually Grow
Not every crop makes sense indoors. The economics favor small, fast-growing, high-value plants. Here’s what’s working right now:
- Microgreens are the fastest path to revenue, selling for $25 to $50 per pound retail. They’re ready to harvest in 7 to 14 days, allowing 20 or more harvests per year from the same growing space.
- Leafy greens are the backbone of the industry, but profitability depends on variety. Butterhead lettuce, living lettuce sold with roots still attached, and specialty blends command better margins than commodity romaine that has to compete with cheap field-grown alternatives.
- Culinary herbs like basil, mint, and cilantro sell for $10 to $15 per pound and can generate $25 or more per square foot annually. The key selling point is consistency: restaurants and retailers want the same flavor and leaf size every week, regardless of season.
- Strawberries represent the industry’s biggest crop expansion. Premium pricing and year-round demand make them attractive, though they require more capital and technical skill than greens.
- Ultra-premium crops like wasabi, saffron, and vanilla sit at the extreme end of the value spectrum. Real wasabi can sell for $250 or more per kilogram and is notoriously difficult to grow conventionally, which makes controlled environments a natural fit.
For some crops, vertical farms can produce 10 to 20 times the yield per acre compared to open-field growing, according to the USDA. That productivity advantage is what makes indoor farming viable despite the higher operating costs.
Water and Chemical Savings
The environmental case for vertical farming centers on two numbers: up to 98% less water and near-zero pesticide use. Closed-loop hydroponic systems recirculate water continuously, losing only what the plants absorb and small amounts to evaporation. In regions facing drought or water scarcity, this is a significant advantage.
Because the growing environment is sealed and climate-controlled, there’s essentially no need for herbicides or pesticides. No weeds compete with crops when there’s no soil and no exposure to the outdoors. No insect pests means no insecticide. The result is produce that’s grown cleanly by default, without needing organic certification programs to verify it. Fertilizer use also drops substantially, since nutrients dissolved in recirculating water are absorbed more efficiently than those spread across open fields.
The Energy Problem
Vertical farming’s biggest challenge is electricity. Producing one kilogram of lettuce in a vertical farm requires roughly 7 to 11 kilowatt-hours of electrical energy. For context, that’s comparable to running a window air conditioner for a full day, just for about two pounds of lettuce. Lighting and dehumidification together account for over 95% of that energy draw.
This energy intensity means vertical farms are only as clean as their electricity source. A facility powered by renewable energy has a genuinely small environmental footprint. One running on coal-fired grid power may produce more carbon emissions per head of lettuce than a traditional farm that trucks its produce hundreds of miles. The production cost in one case study worked out to roughly $3.78 per kilogram of lettuce, with electricity as the dominant expense. Operators who can secure cheap, clean power have a structural advantage over those who can’t.
Cranking up light intensity does boost yields, but it also raises energy costs unless you simultaneously optimize other variables like carbon dioxide concentration. When researchers increased both light intensity and CO2 levels together, per-unit production costs actually dropped from $4.03 to $3.30 per kilogram. The interplay between these factors is part of what makes vertical farm management technically demanding.
Who Vertical Farming Is For
Vertical farming makes the most sense in specific situations. Dense urban areas with high land costs and strong demand for local produce are the sweet spot. So are regions with extreme climates, short growing seasons, or limited water. Singapore, the Middle East, and northern European cities have become hotbeds for the industry precisely because conventional farming is difficult or impossible there.
It’s not a replacement for traditional agriculture. Staple crops like wheat, rice, and corn require far too much space and produce far too little per-unit revenue to justify indoor growing. Vertical farming works as a complement to field agriculture, filling specific niches where freshness, consistency, locality, and year-round availability justify the premium cost. The operators succeeding today are the ones who understand this and choose their crops accordingly, competing on quality and reliability rather than trying to undercut commodity pricing from conventional farms.