What It Takes To Make A Super Cold-Hardy Wine Grape

Think a great wine grape can’t survive where winters drop to minus forty? We sit down with breeder Dr. Harlene Hatterman-Valenti from North Dakota State University to unpack how a young industry, a focused research program, and some stubborn optimism produced two new cultivars built for the northern plains. From the early days of variety trials and policy hurdles to the release of Dakota Primus and Radiant, Harlene shares how hybrid genetics, gritty selection, and clever management turned a hostile climate into an advantage.We dig into the science of cold hardiness: why photoperiod sensitivity matters more than you think, how vines must read shortening days to lay down periderm before sudden freezes, and the three critical windows where cold injury strikes—fall acclimation, deep midwinter lows, and late-winter temperature whiplash. Harlene explains the growth calendar for a North Dakota vineyard with just 130 frost-free days, from delayed pruning and cautious budbreak to early-August veraison and mid-September harvests. Beyond the vineyard, we explore how the state’s wine scene found its footing, why regulations evolved to support consistent supply, and how tourism now fuels growth. The conversation closes with what’s next: chasing an ultra-cold-hardy red, expanding into table grapes for farmers markets, and celebrating the team effort—students, specialists, and collaborators—that made progress possible. If you’re curious about cold-climate viticulture, breeding under polar vortex pressure, or how science builds regional wine identities, this one’s for you.Additional information in available in these articles:Complex Plant Process Trait Evaluation Through Decomposition of Higher-order Interaction: A Case Study in Acclimation Responses of Cold-climate Hybrid Grapevine Through Bilinear and Multiway MethodsCold Climate Winegrape Cultivar Sensitivity to Sulfur in the Northern Great Plains Region of the United States‘NDMutant1’: A Novel Determinate Interspecific Grapevine for Genetic and Physiological Study and Breeding ApplicationsEnjoyed the conversation? Follow the show, share it with a friend, and leave a review to help more growers and wine lovers find us.Send us Fan MailLearn more about the American Society for Horticultural Science (ASHS) at  https://ashs.org/.HortTechnology, HortScience and the Journal of the American Society for Horticultural Science are all open-access and peer-reviewed journals, published by the American Society of Horticultural Science (ASHS). Find them at journals.ashs.org.Consider becoming an ASHS member at https://ashs.org/page/Becomeamember!You can also find the official webpage for Plants, People, Science at ashs.org/plantspeoplesciencepodcast, and we encourage you to send us feedback or suggestions at https://ashs.org/webinarpodcastsuggestion. Podcast transcripts are available at https://plantspeoplescience.buzzsprout.com.On LinkedIn find Sam Humphrey at linkedin.com/in/samson-humphrey. Curt Rom is at https://www.linkedin.com/in/curt-rom-611085134/. Lena Wilson is at https://www.linkedin.com/in/lena-wilson-2531a5141/.Thank you for listening!...