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The Willowmere Growers' Cooperative supplies supermarkets year-round by cultivating tomatoes in climate-controlled greenhouses rather than open fields. Sensors regulate temperature, humidity, and carbon dioxide levels, while drip irrigation delivers nutrients directly to each plant's roots. Because the environment is enclosed, growers can also introduce natural predators, such as parasitic wasps, to control aphids without resorting to chemical pesticides. This approach yields roughly four times the harvest per square metre compared with outdoor plots, though the initial cost of constructing and heating the greenhouses is substantial. Cooperative members argue that the higher yield and reduced reliance on seasonal weather ultimately offset these upfront expenses, allowing them to guarantee consistent supply to retailers even during winter months when field-grown tomatoes are unavailable.