Duijvestijn Brothers in Pijnacker near Delft uses geothermal energy that it also supplies to nearby businesses and houses, while taking CO2 enrichment from an oil refinery.
This year, it has also built a research glasshouse to trial cutting-edge approaches including growing under double glazing.
Meanwhile, Loos Nursery of Moerstraten near Breda grows early asparagus under heated glass, as well as year-round strawberries, using sustainable energy from a 2MW biomass plant that it co-owns, which again also supplies neighbourhood homes and businesses.
The winner of the 27th Horticulture Entrepreneur Prize is due to be announced in January.
