Westland: The Greenhouse Cluster That Makes the Netherlands a Vegetable Superpower

Westland is the reason a country the size of Maryland is the world’s second-largest exporter of food and agricultural products, and it did it with glass, gas and a cooperative auction clock rather than with land. The cluster of greenhouses between The Hague and Rotterdam is simultaneously a farm, a power station, a technology park and a labour market, and each of those roles has been tested since 2022. This article explains how greenhouse economics work, why Royal FloraHolland’s auction still matters, what the energy crisis did to the sector, how growers are shifting to LED and geothermal heat, which Westland companies export the know-how, and why labour and tariffs are now the pressing problems. It is part of the Netherlands Company Stories hub.

How does a Dutch greenhouse make money?

By turning a small plot of expensive land into a factory that runs all year. A hectare of Westland glass produces roughly ten times the vegetables of a hectare of Spanish open field, because the grower controls temperature, humidity, CO2 concentration, light and irrigation and can harvest tomatoes from March to November and, with lighting, through the winter. The business model is capital-intensive: a modern Venlo-type glasshouse with heating, screens, LED lamps, climate computers and hydroponic gutters costs several million euros per hectare, and the grower’s margin is the difference between the yield that control delivers and the energy that control consumes.

Energy is the swing cost. Dutch greenhouses used 2.94 billion cubic metres of natural gas in the most recent year reported by the trade association Glastuinbouw Nederland, of which about 1.97 billion heated crops and 0.97 billion was burned in combined-heat-and-power engines whose electricity is sold to the grid. The CHP model, adopted in the 2000s, made the sector a net power producer: it supplies just over 8 per cent of the 119 billion kilowatt-hours the Netherlands consumes, and the CO2 from the engines is fed back into the glasshouses to boost photosynthesis. For twenty years this meant a grower’s energy bill was partly hedged by electricity sales, which is precisely why the 2022 gas spike was so damaging when the hedge broke.

The other distinctive feature is scale and specialisation. The 2,311 specialised businesses include 745 vegetable growers, 876 cut-flower growers, 667 pot and bedding plant growers and 23 fruit growers, and the average holding is now several hectares, with the largest tomato and pepper companies running 50 to 100 hectares across multiple sites. Biological pest control is used on 94 per cent of the national greenhouse area, on 100 per cent of tomato and cucumber area, and growers buy their predatory mites and bumblebees from a company that started as a Westland cucumber nursery.

Why is Westland the centre of the cluster?

Because it combined sandy soil, mild coastal light and proximity to the markets of The Hague and Rotterdam at the moment, in the late nineteenth century, when cheap glass made the first lean-to greenhouses affordable. The municipality of Westland, formed on 1 January 2004 from the merger of De Lier, ‘s-Gravenzande, Monster, Naaldwijk and Wateringen, has around 111,000 inhabitants on just over 90 square kilometres and, by most sector estimates, roughly a quarter of the country’s specialised greenhouse area, making it the densest concentration of glass anywhere. The remaining glass is spread across Oostland to the north-east, Barendrecht, the Aalsmeer region, Venlo in Limburg and newer developments in Flevoland, Zeeland and Brabant.

What distinguishes Westland is the supply chain that grew up around the glass. Within a few kilometres of Naaldwijk sit the Royal FloraHolland auction at Honselersdijk, the World Horti Center, a campus with 39 research greenhouse compartments run by Vertify, 1,200 students a day at MBO Westland and about 40,000 visitors a year, and the headquarters of the climate-computer, greenhouse-construction, seed-breeding, packaging and logistics companies that serve growers worldwide. The regional partnership Greenport West-Holland describes the cluster as a triple helix of entrepreneurs, governments and knowledge institutions whose ambition is to be the global horticultural hotspot for food supply and health. In 2026 the municipality and the province of Zuid-Holland settled a long-running dispute over the greenhouse-horticulture vision for the area, which turns on how much glass should be preserved against housing demand from the Randstad.

The Netherlands exported €12.3 billion of ornamental horticulture products, flowers and plants, and €9.4 billion of vegetables in 2025, according to the CBS statistics office and Wageningen Economic Research, with Germany taking a quarter of all agricultural exports. Cut-flower exports alone were about €4.2 billion in 2023 and plant exports €2.6 billion. Those numbers, however, include large volumes of foreign product: two-thirds of the roses the Netherlands exports are imported from Kenya and Ethiopia, and only 16 per cent of the roses traded at auction before Valentine’s Day 2024 were grown on Dutch soil. The cluster’s role is increasingly to trade, breed and engineer rather than to grow everything itself.

What role does Royal FloraHolland play?

It is the price-setting mechanism for the world’s flower trade and, like FrieslandCampina, a cooperative owned by its suppliers. Royal FloraHolland was formed on 1 January 2008 from the merger of FloraHolland and the Aalsmeer flower auction, and it runs export auctions at Aalsmeer, Naaldwijk and Rijnsburg plus a domestic one at Eelde. Around 3,000 growers are members; the cooperative had about €5.1 billion of turnover in 2023, when it posted a €17 million loss for the second year running because wage costs rose by €16 million and energy bills by €6 million while the volume of flowers and plants sold fell 3 per cent. Its chairman Steven van Schilfgaarde called the results disappointing and complained that political negativity about horticulture was weighing on the sector.

The auction’s historic function, the descending-price clock in which lots are sold in seconds to the first buyer to press, now accounts for a minority of volume; most product is sold through direct contracts between growers and buyers, with the cooperative providing the Floriday digital marketplace, logistics, payment guarantees and quality standards. During the pandemic in March 2020 sales fell more than 70 per cent and around 400 million flowers were destroyed in a single month; the cooperative responded by buying three transport companies, De Winter, Wematrans and Van Zaal, to create its own logistics arm, Floriway. Its 2030 strategy concentrates on day trade, shifting the physical hubs toward Aalsmeer and Naaldwijk and investing in the platform.

For Westland growers the auction is a guarantee of liquidity and a source of data: every lot sold produces a price that competitors see within minutes. For the port of Rotterdam and Schiphol it is a logistics customer that moves perishable product to 140 countries. For the Dutch economy it is one of the reasons the Netherlands is a trading hub for flowers it does not grow, in the same way that Rotterdam is a hub for oil it does not produce.

What happened to growers in the 2022 gas-price shock?

They stopped growing. When Dutch gas prices rose roughly tenfold during 2022, the economics of heating and lighting a glasshouse through the winter inverted, and growers who had not hedged their energy did the arithmetic and left the glass dark. Royal FloraHolland reported that many growers scaled back or suspended operations in the autumn and winter of 2022 to 2023; Dutch rose production fell by a third in a year; and greenhouse vegetable output dropped almost 8 per cent to 1.8 million tonnes in 2022, with tomatoes down by 110 million kilograms and cucumbers down 10 per cent. Shops filled the gap with imports from Africa, South America, Spain and Morocco. In October 2022 Glastuinbouw Nederland said that one in eight businesses in the sector was likely to fail; three bankruptcies were recorded in the fourth quarter alone, and many more growers simply did not restart.

The policy response was modest by the standards of what the Dutch state spent elsewhere. The government allocated €77 million of subsidies to help growers cut energy use and shift to sustainable methods, and the sector’s own Kas als Energiebron programme accelerated research into energy-saving cultivation. Growers with CHP engines and long-term gas contracts, by contrast, found themselves selling electricity at record prices; the crisis widened the gap between large, hedged, technologically advanced companies and smaller family businesses, and consolidation followed. The number of flower growers fell to 2,100 by 2024, 300 fewer than in 2019, according to CBS, and cut-flower exports fell 5 per cent in 2023.

How are growers shifting to LED and geothermal heat?

By replacing gas with electricity and heat from underground, which changes both the cost structure and the regulatory exposure of the sector. The first lever is light. High-pressure sodium lamps, which heated as much as they lit, are being replaced by LED fixtures that use far less electricity per unit of light and allow growers to tune the spectrum; the technical press in 2026 is full of work on multi-channel LED, simulated dusk and reduced lighting strategies, and the main constraint is no longer the lamp but the grid connection, since an electrified greenhouse draws power rather than exporting it. Grid congestion, which the TenneT article describes in detail, now blocks electrification in several greenhouse areas.

The second lever is geothermal heat. The Dutch sector pioneered deep geothermal for horticulture after the first well at Bleiswijk in 2007; by the latest count 17 wells supply 237 businesses covering 1,746 hectares, delivering 7.1 petajoules of heat a year, 3.6 from growers’ own wells and 3.5 purchased from projects such as Aardwarmte Maasdijk and Vogelaer in Westland and Trias Westland. In 2025 three new energy and heat cooperatives were founded, bringing the total to 17, new wells in Westland and Oostland started production, demand for sustainable heat outstripped supply with many projects fully sold out, and a heat-trading platform was tested at Maasdijk for roll-out in 2026. The January 2025 round of the SWIG subsidy for greenhouse sustainability was oversubscribed. Renewable sources now cover just over 15 per cent of the sector’s energy, and cultivation emissions of 3.5 million tonnes are 49 per cent below 1990 even though total emissions including CHP electricity, 5.2 million tonnes, are only 25 per cent lower.

The policy stick is a sector-specific CO2 levy on greenhouse horticulture, introduced from 2025 alongside the phasing out of the reduced energy-tax rate the sector had enjoyed. Glastuinbouw Nederland’s position in its 2025 annual review was that additional pricing measures slow the transition and that the state should instead invest in grid capacity, external CO2 supply, which growers need once they stop burning gas, and sustainable heat networks. The Kas als Energiebron programme started 35 new research projects in 2025, held more than 40 meetings with over 3,000 visitors and enrolled 150 growers in a structured course on “het nieuwe telen”, the energy-efficient cultivation method; the MEI innovation scheme received 21 applications worth about €20 million.

Which Westland companies export the technology?

The ones that solved the growers’ own problems first. Priva, based in De Lier in the heart of Westland, began more than 65 years ago as a local greenhouse-heating company and became the dominant supplier of climate computers, the control systems that manage temperature, humidity, irrigation and CO2 in a glasshouse. Led by chief executive Meiny Prins, a member of the founding Van den Ende family, it employs more than 560 people across 15 offices, sells through more than 400 distributors in over 100 countries and has installed its systems in more than 10,000 horticulture projects and, through a second business in building automation, in more than 40,000 buildings. Its software is the operating system of greenhouses in Canada, Mexico, China and the Gulf that were built by Dutch contractors.

Koppert, headquartered just outside the Westland cluster in Berkel en Rodenrijs, is the other global name. Jan Koppert, a cucumber grower, founded it in 1967 after looking for a natural alternative to the chemical pesticides that were damaging his own health and crop, and the company now breeds predatory mites, parasitic wasps, nematodes, microbial agents and bumblebees for pollination. It remains a family company with more than 3,000 employees, sales in more than 100 countries, production outside Europe including a first facility in the United States and the Brazilian acquisition Itaforte, and a domestic customer base that uses biological control on 94 per cent of Dutch greenhouse area. The shift of tomato growers to predatory mites against thrips, from 18 per cent of area in 2020 to 66 per cent in 2024 according to CBS, is a Koppert sales curve.

Around them sits a long tail of exporters: the greenhouse builders and installers organised in AVAG, who are involved in constructing about 80 per cent of the world’s new greenhouses; the seed breeders of the Westland and nearby Enkhuizen; and the packaging, robotics and vertical-farming companies that congregate at the World Horti Center. This is the part of the cluster that scales without land, and it is the part that the Dutch state, which is reducing the livestock herd through the nitrogen policy, points to as the future of its agriculture. It is also now exposed to trade policy: in September 2025 AVAG chair Annie van de Riet said that the 50 per cent US tariff on steel and aluminium, combined with tariffs on the Chinese glass that most greenhouses use, had raised the cost of building a greenhouse by about 25 per cent, brought US projects virtually to a standstill and cost Dutch builders tens of millions of euros; Atrium Agri’s chief executive Marck Hagen said his consortium had begun assembling parts in the United States and was looking to Abu Dhabi and South America instead.

Who works in the greenhouses, and what is the labour problem?

Mostly migrant workers employed through temporary-work agencies, and the problem is that the sector’s labour model is cheaper than it is sustainable. Greenhouse horticulture employs 58,300 people in a normal month and up to 91,920 at peak, counting employees, agency workers and the self-employed, and only 2,018 of the specialised businesses have permanent staff. Much of the harvesting, packing and crop work is done by workers from Poland, Romania, Bulgaria and, increasingly, third countries, housed in agency accommodation or on growers’ sites. Glastuinbouw Nederland’s own 2025 review acknowledged that this group is vulnerable on housing, income security and scheduling, and extended its action plan on good employership and hiring practice into 2026.

The enforcement side is visible. In October 2025 the Labour Inspectorate fined two Westland companies and a Polish agency a combined €432,000 for illegally employing 32 third-country nationals without work permits, under rules that since February 2025 allow fines of up to €11,250 per worker for intentional abuses such as withholding passports or substandard housing; the companies received a preventive work-stoppage warning. In 2026 the municipality had to house 147 Ukrainian workers after a grower failed to meet his obligations, and inspection visits to Westland growers were stepped up to make exploitation more visible. The labour inspectorate noted in October 2026 that agency workers have more accidents than permanent staff.

The structural answer the sector offers is automation. Its 2050 ambition, published in the 2026 key figures, is that robotics, digitalisation and artificial intelligence make manual labour nearly unnecessary and cultivation largely autonomous; harvesting robots for tomatoes and cucumbers are in trials, and labour productivity has been tracked by CBS since 2017. In the meantime the sector received €7.2 million of SLIM training subsidies in 2025 from a €73.8 million national budget and has drawn up career-development paths to attract Dutch school leavers, which the trade press promotes to teenagers during the autumn holidays.

What can founders and investors learn from Westland?

The first lesson is that a cluster’s value lies in its density, not its size. Ten thousand hectares is a rounding error in global agriculture, but 2,311 businesses, an auction, a research campus, a trade school and the world’s leading climate-computer and biological-control companies within a thirty-minute drive of each other produce knowledge spillovers that no single large company can replicate. Founders choosing a location should weigh proximity to customers and rivals above cheap space.

The second is that an energy hedge is a strategy, not a treasury function. The CHP engines that turned greenhouses into power stations were a brilliant answer to the 2000s and a liability in 2022, and the growers now investing in geothermal cooperatives are buying thirty years of price stability at the cost of a large upfront commitment. Chief financial officers in any energy-intensive business should ask which of their cost advantages is actually a bet on one price.

The third is that exporting the know-how outlasts exporting the product. The Netherlands will not grow Kenya’s roses or Mexico’s tomatoes, but it will control the greenhouses, breed the seeds and supply the predatory mites, and that is a higher-margin, lower-land position than growing. For a comparison with how a Dutch cooperative handled the same combination of price shock and structural change in dairy, see the FrieslandCampina article; for the family-controlled model that lets a Dutch consumer company invest through cycles, see Heineken. The broader trade position of the sector is set out in the article on the Netherlands as the world’s second-largest agricultural exporter, and readers interested in how water management shapes the Westland landscape can turn to the Delta Works and water economy story.

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