Hydroponic Greenhouse: Systems, Costs and US Market Data

A hydroponic greenhouse is a greenhouse where crops grow without soil, with their roots fed by a recirculating or dripped nutrient solution. It is already a large part of US protected food growing: in the USDA NASS 2024 Census of Horticultural Specialties, about 60% of the food crops grown under protection by weight came from hydroponic systems, and 3,731 operations sold $1.01 billion of protected food crops, hydroponic and soil-grown.

This guide explains how a hydroponic greenhouse works, the main systems growers put inside one (NFT, deep water culture and drip in substrate), what the market looks like in the US, Canada and Australia, and what it costs per square foot and per kilogram, with the date of every figure. It also separates modelled energy and water numbers from measured ones, gives a step-by-step plan to start, and ends with a revenue and cost calculator you can fill in with your own quotes.

What is a hydroponic greenhouse?

It has two parts. The greenhouse is the shell: a frame with film, glass or polycarbonate that lets light in and keeps weather out, plus heating, cooling, fans and shade. The hydroponic system is the growing method inside: channels, ponds or bags of inert media where water carries all the nutrients the plant needs.

The University of Kentucky crop profile on hydroponic lettuce (2025) puts it plainly: in every hydroponic system, all plant nutrition comes through the irrigation water. It also warns that hydroponics demands more knowledge, skill and money than many other ways of growing, and that someone must check the crop every day.

Natural sunlight does most of the work in a greenhouse. That is the main difference from an indoor vertical farm, which uses only LED light in a closed building. Greenhouses still use extra lighting in dark months, and heating in cold climates, so energy is a large cost in both.

What it controls and what it does not

• Root zone: nutrient strength (EC), pH, water temperature and, in water-based systems, dissolved oxygen.
• Air: temperature, humidity, air movement and sometimes CO₂.
• Light: shade cloth in summer, extra lights in winter if the crop needs them.
• Not fully controlled: outside weather, the sun’s daily light, pests that enter through vents and doors, and power cuts.

▶ Ten small agriculture businesses, including microgreens, aquaponics and vertical hydroponic systems. · 8:32

Hydroponic systems used inside a greenhouse

Four systems cover most commercial greenhouse setups. Leafy greens and herbs grow mainly in water-based systems (NFT and deep water culture). Tall crops such as tomatoes, cucumbers and peppers grow mainly in bags or slabs of substrate fed by drip lines.

1. Nutrient film technique (NFT)

Plants sit in holes along sloped channels. A pump sends a thin film of solution down each channel and back to a tank. Cornell’s controlled-environment team (Mattson, GPN, October 2016) describes channels sloped 1–4% to a drain. NFT uses little water, but roots dry out fast if the pump or power fails.

Best for: lettuce, basil and other herbs; growers who want high plant counts on benches and low water volume.

2. Deep water culture (DWC), also called raft or pond culture

Foam rafts float on a pond of nutrient solution about a foot deep. Air pumps and air stones keep oxygen in the water. Cornell notes that a 5- to 6-ounce lettuce head can be grown from seed in about 35 days in this kind of system, and warns of crop failure when dissolved oxygen falls below 3 ppm. The large water volume buffers temperature and pH swings, which gives the grower more time if something breaks.

Best for: lettuce and leafy greens at steady volume; new growers who value a forgiving system.

3. Drip irrigation in substrate

Plants grow in containers, bags or slabs filled with media such as rockwool, coco coir or peat-based mixes. Drip emitters deliver solution on a timer. The Kentucky profile notes this gives precise water and nutrient delivery per plant, but emitters can clog and setup takes more labor.

Best for: tomatoes, cucumbers, peppers and strawberries; any crop that grows for months and needs support.

4. Ebb and flow (flood and drain)

Benches or trays flood with solution on a timer, then drain back to a tank. The layout is flexible and works for plants of all sizes, so it suits mixed and potted crops. Kentucky notes it does not work for propagation.

Best for: potted herbs, potted lettuce and mixed small-scale production.

Greenhouse hydroponic systems compared

Plant densities and risks are from Table 2 of the University of Kentucky profile (2025). Lettuce is the example crop; spacing for fruiting crops is much wider.

▶ Inside a blueberry greenhouse in Niğde, Turkey: substrate choice, precision irrigation and climate controls. · 2:31

US hydroponic greenhouse market: USDA census data

NASS counts food crops “grown under protection”, which covers greenhouses, shade structures and other covers, hydroponic or not. In 2024, 3,731 US operations sold $1.011 billion of these crops from 89.6 million square feet of covered area (Table 15). The NASS census highlights report that this was 44% more than in the 2019 census. All US horticulture, including flowers and nursery plants, reached $18.3 billion from 23,060 operations, according to the NASS release of 26 February 2026.

Chart

US sales of food crops grown under protection, by crop

Million dollars, 2024, selected crops; includes hydroponic and soil-grown crops under cover

Tomatoes lead on sales, then lettuce. Herbs and microgreens are smaller but still each sold about $86 million.

Sales per square foot of covered area tell a different story. Dividing each crop’s 2024 sales by its covered area in Table 15 gives about $29 per sq ft for microgreens, $25 for lettuce, $15 for cut herbs, $7.50 for tomatoes and $6.30 for cucumbers (our arithmetic). Fast leafy crops turn over many times a year, while vine crops occupy the house for months. These are averages across all operations, soil and hydroponic, so they are a guide to crop choice, not a revenue promise for one greenhouse.

The census also records how much of each crop came from hydroponic systems. For lettuce the share was about 85% of output by weight, for cucumbers about 79%, for tomatoes about 68% and for cut herbs about 31%. These shares are our division of the NASS hydroponic column by the total column; they measure output, not the number of farms.

Chart

How much of each crop is hydroponic

Million pounds harvested, 2024, selected crops grown under protection in the US

Canada and Australia

Canada has one of the largest greenhouse vegetable sectors in North America. Statistics Canada (The Daily, 24 April 2025) reports 33.3 million m² of greenhouse area in 2024, up 4.0% on 2023, with 70% used for fruit and vegetables. Ontario held 63.9% of the area, British Columbia 18.5% and Quebec 10.7%.

The Agriculture and Agri-Food Canada statistical overview for 2024 counts 974 commercial greenhouse vegetable operations that produced 866,484 tonnes, 5% more than in 2023, with Ontario at 72% of output. Tomatoes, peppers and cucumbers fill about 92% of the harvested area. Lettuce is small at 383,002 m², or 1.6% of the area.

In Australia, the first national protected-cropping map, delivered through Hort Innovation and led by the University of New England, shows about 14,000 hectares of glasshouses, polytunnels, nets and shadehouses (The Land, 30 July 2023). That figure includes netting, so it is much larger than the area under closed greenhouses alone.

Chart

Canada’s greenhouse vegetable area by crop

Harvested area, million square metres, 2020 to 2024, the three largest crops

How much does a hydroponic greenhouse cost?

Cost has three layers: the structure, the growing system and the yearly running cost. Published figures are scarce and often old, so treat every number below as a starting point for quotes, not a price list.

Chart

Approximate greenhouse structure cost by style

Dollars per square foot, from a 2016 extension handout (original estimates may be older); structure and heating/cooling, no hydroponic system

Structure cost per square foot

A 2016 Missouri State University extension handout (Greenhouse Construction and Basic Operation) reproduces approximate costs from the University of Arkansas. They run from $1.25 per square foot for a plastic-film hoop house with no heating or cooling to $20 for an aluminium frame with glass or polycarbonate. The handout says costs vary with location, terrain and distance to utilities. The handout is dated 2016 and the Arkansas estimates may be older; steel, film and labor cost more now, so get current quotes.

Yearly cost per square foot: a Missouri extension budget

The University of Missouri Extension hydroponic leafy greens planning budget (G695) models a 2,816 sq ft deep water culture greenhouse at April 2024 price forecasts. It assumes 85% of the floor is used for growing, 30 heads per square foot per year and 95% of heads sold.

The budget prices heads at $1.50 wholesale and $2.75 retail. Labor and utilities together make up about 55% of total cost, so local wage and energy rates decide most of the result. The authors give a “Your estimate” column because these are Missouri planning figures, not a forecast for your site.

Cost per kilogram

Per-head costs convert to per-kilogram costs once you know head weight. Kentucky’s profile gives 100 to 210 g for a fully grown hydroponic lettuce. At the Missouri total cost of $1.29 per head, that is roughly $6 to $13 per kg of lettuce (our arithmetic: $1.29 divided by 0.21 kg and by 0.10 kg). Heavier heads lower the cost per kilogram; the calculator below lets you test this.

For a European view, a 2026 model in Frontiers in Sustainable Food Systems benchmarks vertical farms against Dutch greenhouse data from KWIN 2023, using €0.111 per kWh for electricity and €22.50 per hour for labor. Its main finding is about vertical farms: cost per kilogram depends mostly on how much light reaches the crop and how well plants turn it into growth, and lighting was the largest capital cost. In the Missouri greenhouse budget above, labor and utilities are also the two largest costs.

Revenue and cost calculator

Enter your own greenhouse size, yield, price and costs. The default values are round examples set close to break-even. They are loosely in the range of the 2024 Missouri budget, but they are not a benchmark or a forecast for any farm. Replace each one with your own quotes.

Try the numbers for your own farm below.

Energy and water use: modelled vs measured

Hydroponic greenhouses use far less water per kilogram than field crops, but they can use far more energy. Most published figures come from models, so check the basis before you compare.

Chart

Energy per kilogram of lettuce, by study basis

kWh per kg fresh weight; modelled and reported figures from different years and places, not directly comparable

• Modelled, Arizona (2015): a study by Barbosa and colleagues in IJERPH estimated hydroponic greenhouse lettuce at 41 kg/m² per year, 20 litres of water per kg and 90,000 kJ per kg, about 25 kWh per kg. Field lettuce in Yuma, from farm statistics, used 250 litres and 1,100 kJ per kg. That is about 11 times the yield for about 82 times the energy.
• Reported, one commercial vertical farm: a 2025 paper in Plant Physiology (on PMC) cites Martin et al. (2023): about 5 million kWh for about 500,000 kg of lettuce a year, or roughly 10 kWh per kg of electricity.
• Modelled, Netherlands (2026): the Frontiers study uses 3.81 kWh per kg for Dutch greenhouse lettuce from KWIN 2023, before counting electricity that greenhouses with combined heat and power sell back to the grid.

The Arizona water figure is about 92% lower than the field figure (our arithmetic). That fits the common “up to 90% less water” claim for leafy greens, but it is a modelled result for one place. Water saving also depends on how often the grower dumps and replaces the solution. Kentucky advises a full or partial replacement every 3 to 4 weeks.

Heating is often the largest energy item in cold regions. The University of Arizona CEAC gives a simple heat-loss formula for sizing a heater: heat loss equals the U-value of the cover, times the surface area, times the gap between the lowest inside and outside temperatures (Giacomelli, CEAC). Double-layer film, energy curtains and tight doors cut that loss.

How to start a hydroponic greenhouse: 8 steps

1. Find buyers first. Kentucky advises talking to local grocers and specialty retailers about quality, packaging and price before building. Hydroponic costs are higher than field costs, so you need a premium market or enough scale.
2. Pick one or two crops. Lettuce and herbs turn over in weeks; tomatoes and cucumbers need taller houses and longer seasons.
3. Match the system to the crop. NFT or deep water culture for greens; drip in substrate for vine crops.
4. Test your water. Send a sample to a lab for pH, EC, alkalinity and minerals. Well or municipal water carries less disease risk than pond or river water.
5. Size the structure and heating. Use the heat-loss formula above for your coldest night, and plan cooling and shade for summer.
6. Build a budget. Start from an extension budget such as Missouri’s G695 and replace each line with local quotes. Run the calculator above with low, middle and high prices.
7. Plan for failure. Install alarms for power, pump and temperature, and keep a backup power source for pumps and air.
8. Start small and record everything. Track EC, pH, dissolved oxygen, days to harvest and head weight for each batch. Grow only after the first crops sell.

Rules on building permits, water discharge, food safety and business licences vary by state, province and country. Check local rules and get professional advice on finance and tax before you commit money.

▶ Ten farm businesses you can start small, including hydroponic herbs and lettuce, each with a first step. · 6:03

Day-to-day management targets

Extension sources agree on a narrow set of root-zone targets for hydroponic lettuce, the most common greenhouse crop.

• EC: about 1.2 dS/m at germination and 1.5–1.8 dS/m in production as common NFT practice, per UF/IFAS EDIS AE610 (2025), whose own trial found 1.2 dS/m did not reduce growth; Cornell uses about 1.5.
• pH: 5.5 to 6.0, according to Kentucky, which notes that alkaline well water often needs acid.
• Air temperature: no more than 75 °F (24 °C) by day and 65 °F (18 °C) by night to avoid bolting, per Kentucky.
• Light: a daily light integral of 12–17 mol/m²/day is optimal for lettuce (Kentucky). Cornell reports 5–6 oz heads 24 days after transplant at 17 mol/m²/day.
• Humidity: 50% to 70% relative humidity, with steady air movement to limit tipburn.

Fertilizers and any crop protection products must be used as the label states. Follow the label and your local rules, and ask your county Extension agent or a greenhouse specialist to check your recipe against your water test.

What can go wrong

• Power and pump failure. NFT roots dry out quickly when the flow stops. Deep water culture gives more time but loses oxygen.
• Waterborne disease. In shared solution, a root pathogen can spread to every plant on the system.
• Heat in summer. Lettuce bolts and turns bitter when it gets too hot; shade and evaporative cooling help.
• Thin margins. In the Missouri budget, income over total costs was $8.15 per square foot. A price about 21% lower would wipe it out (our arithmetic).
• Selling the crop. Kentucky notes that wholesale lettuce is dominated by large growers in the western US, so smaller greenhouses often depend on direct sales.

Related pages on our site: large-scale farm management, fleet management, product traceability, carbon footprinting and the satellite and weather API documentation.

Satellites cannot see crops under a greenhouse roof. Farmonaut is more useful for the outdoor fields that many greenhouse growers also farm, and its API gives agtech teams weather and satellite layers for sites they choose.

How we checked the numbers

Market figures come from the USDA NASS 2024 Census of Horticultural Specialties (Table 15 and the census highlights), Statistics Canada and Agriculture and Agri-Food Canada. Costs come from the University of Missouri Extension budget G695 (April 2024 prices) and a 2016 Missouri State University handout. Growing targets come from the University of Kentucky, Cornell and UF/IFAS. Energy and water figures are labelled as modelled or reported, with the year. Where we did our own arithmetic (shares, per-kilogram costs), the text says so.

FAQ

What is the difference between a hydroponic greenhouse and a vertical farm?

A greenhouse uses sunlight through a clear cover, with extra lights only when needed. A vertical farm stacks crops in a closed building lit only by LEDs. The 2026 Frontiers model found that vertical-farm lettuce used less electricity per kilogram than the Dutch greenhouse reference only in its scenarios with high light-use efficiency.

What grows best in a hydroponic greenhouse?

Lettuce, herbs, tomatoes, cucumbers, peppers and strawberries. In the 2024 US census, tomatoes had the highest sales at $383.0 million, followed by lettuce at $238.3 million.

How much does it cost to run a small hydroponic greenhouse?

In the University of Missouri budget for a 2,816 sq ft deep water culture greenhouse (April 2024 prices), total costs were $87,967 a year, or $31.24 per square foot, with labor and utilities the largest items. Your costs will differ with wages, energy prices and climate.

Is a hydroponic greenhouse profitable?

It can be, but margins are thin. The Missouri budget shows $22,955 a year over total costs on $110,922 of income at its assumed prices. Use the calculator on this page with your own prices and costs, and get professional financial advice before investing.

Does a hydroponic greenhouse use less water?

Per kilogram, usually yes. One 2015 Arizona model estimated 20 litres per kg for hydroponic greenhouse lettuce against 250 litres per kg for field lettuce. The same model found energy use about 82 times higher.