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flag Owl Bluff Farm in Minnesota uses a fossil-fuel-free greenhouse to grow organic crops year-round in winter.

flag Owl Bluff Farm in Houston County, Minnesota, is preparing to grow crops through its first winter using a deep winter greenhouse, one of five prototypes developed by the University of Minnesota. flag The farm, operated by Carrie Calvo and Ari Struver with family support, produces certified organic vegetables and is named for local barred and great horned owls. flag The greenhouse, part of a sustainable agriculture research initiative, enables year-round growing in cold climates without fossil fuels. flag An open house was held in September 2025 to showcase the project, which aims to advance climate-resilient farming in northern regions.

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