Dutch Grower Jan-Willem Doelman Advances Yellow Courgette Harvest with Geothermal Heating
GEOTHERMAL
Jan-Willem Doelman, a Dutch grower in the Westland region, has advanced his yellow courgette harvest by nearly a month due to investments in geothermal heating and greenhouse climate control. Doelman operates a compact greenhouse focusing on niche products such as yellow courgettes and courgette fleurs, which have increased in demand. He emphasizes sustainable practices, a small team, and mentoring young workers, including Finn Verduijn, who started his own business, Finn's Fleurs, selling courgette products.

Feb 17, 2026, 10:33 PM