Almería: Europe’s Winter Vegetable Garden and Its Water Problem

Spain is Europe’s winter greengrocer, and the industry that made it so is one of the most remarkable and most contested agricultural developments in modern Europe. A poor, arid province transformed itself into an export machine within a generation, generating substantial wealth alongside serious environmental and labour controversies. This analysis explains the economics and the constraints. It is part of the Spain Company Stories hub.

Why does the model beat Dutch glasshouses?

On energy. Dutch horticulture is technically outstanding and produces extraordinary yields per square metre, but it heats and lights greenhouses through northern winters, which is the largest single cost in the operation and rises with energy prices.

Almería produces in unheated plastic structures because the climate provides the heat and light. Capital cost per hectare is a fraction of a modern Dutch installation, yields per square metre are lower, and total cost per kilo delivered to a German supermarket is lower still.

That trade-off — lower technology, lower capital, lower yield, much lower energy — is why the industry grew where it did. It is also why the European energy price shock of 2022 hurt Dutch growers far more than Spanish ones and shifted competitive position toward the south.

How is the industry structured?

Around small holdings and large cooperatives, which is unusual for an export industry of this scale. Individual greenhouse holdings are typically small family operations of a few hectares, while marketing, grading, packing and export are handled by cooperatives and trading companies that aggregate the output.

That structure spreads the wealth generated more widely than a plantation model would, and it created a genuine regional middle class in what had been one of Spain’s poorest provinces. It also fragments decision-making on water, plant health and technology adoption.

The commercial power sits downstream. European supermarket buyers negotiate with a small number of large exporters who in turn deal with thousands of growers, and the price pressure exerted at the top of that chain passes through to the field.

How serious is the water problem?

Existential in the long run. The region receives very little rainfall, and the industry’s expansion was financed hydrologically by pumping groundwater faster than aquifers recharge, in some areas causing saline intrusion as seawater replaced extracted freshwater.

Desalination is the technical answer and an expensive one. Desalinated water costs substantially more than groundwater and carries an energy requirement, which is viable for high-value crops and marginal for low-value ones. It effectively raises the price floor below which production is uneconomic.

The industry has responded with genuinely impressive efficiency measures: drip irrigation, hydroponic systems, water recycling and substrate cultivation that use a fraction of the water per kilo that field agriculture requires. Almería is among the most water-efficient agricultural systems in the world per unit of output, and it still uses more water than the region has.

What about the labour controversy?

It is real, documented and unresolved. The industry depends heavily on migrant labour, much of it from North and West Africa, and conditions in parts of the sector — wages, housing, contract status — have been the subject of sustained investigation by journalists, unions and European institutions.

The industry’s response has been that conditions vary enormously between operations, that certified exporters supplying major retailers are audited, and that the worst practices occur in the informal margins of the sector rather than in the supply chains reaching European supermarkets.

That defence is partially true and insufficient. European due diligence legislation now places responsibility on buyers to identify and address adverse human rights impacts in their value chains, which shifts the enforcement burden from Spanish labour inspection to retailer compliance departments — a change likely to be more effective.

What is the competitive outlook?

Pressure from Morocco and from climate. Moroccan production of tomatoes and other vegetables for European markets has expanded substantially, with lower labour costs and preferential trade access, and it competes directly in the same winter window.

Climate cuts both ways. Warming reduces the heating advantage Almería holds over northern producers in relative terms, while increasing water stress and heat damage locally. Extreme summer temperatures already make some crops difficult to grow in the peak months.

The strategic direction is upmarket: higher-value specialty varieties, organic production, and certification that supermarkets pay for. That is the same conclusion reached across Spanish agrifood, from olive oil to Ibérico pork — when you cannot win on cost, the only durable position is one where cost is not the deciding factor.

What technology is the industry adopting?

Substantial and often underestimated. Hydroponic and substrate cultivation, computerised fertigation, biological pest control using beneficial insects rather than chemical pesticides, and increasingly climate control and monitoring within the plastic structures.

Biological pest control is the most striking. Almería converted a very large share of its production to integrated pest management within a few years, driven initially by a residue scandal in export markets, and it now uses predatory insects at a scale few agricultural regions match.

That episode is instructive: a market shock over pesticide residues forced a change that voluntary programmes had failed to achieve for years. Export-dependent agriculture responds to buyer requirements far faster than to regulation.

What happens to the plastic?

It is a genuine waste management problem that the industry has partially addressed. Greenhouse covers are replaced every few years, generating very large volumes of used plastic film alongside substrate, string, packaging and plant waste.

Collection and recycling systems have been established, and a proportion of the material is recovered and reprocessed, but enforcement across thousands of small holdings is difficult and illegal dumping has been a persistent problem in parts of the region.

European rules on packaging, plastics and agricultural waste are tightening, and buyers increasingly ask about it. As with pesticide residues, the change is most likely to come from retailer requirements rather than from regulation alone.

What would happen without the greenhouses?

Northern European winter vegetable supply would shift to Morocco, Turkey and heated glasshouse production at substantially higher prices. There is no idle alternative capacity at Almería’s scale and cost.

Locally, the consequences would be severe. The province transformed from one of Spain’s poorest to a substantial exporter within a generation on the back of this industry, and no alternative economic base of comparable scale exists.

That dependence is exactly why the water question is so difficult. The rational hydrological response — reduce irrigated area — is economically and politically unavailable, which means the practical path is efficiency, desalination and crop mix rather than contraction.

How does this affect European food security?

It concentrates a substantial share of winter fresh produce supply in one small region, which is efficient and fragile in equal measure. European consumers expect year-round availability of vegetables that cannot be grown locally in winter without heating.

The alternatives all cost more: heated northern glasshouses, longer-distance imports from Africa or Latin America, or seasonal availability. None is politically or commercially attractive, which is why the Almería model persists despite its water problem.

The strategic implication for European policy is that food security in fresh produce depends on water availability in southern Spain and Morocco. That is a considerably less comfortable position than the aggregate self-sufficiency statistics suggest.

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