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James A. Schrader, Diana R. Cochran, Paul A. Domoto and Gail R. Nonnecke

cold-tolerant of these selections is a group commonly referred to as “northern hybrids,” which are cultivars based on interspecific hybridization between european common grape ( Vitis vinifera ) and native grape species such as riverbank grape ( Vitis

Open access

James A. Schrader, Diana R. Cochran, Paul A. Domoto and Gail R. Nonnecke

; Minnesota Grape Growers Association, 2016 ). We examined the winterhardiness and annual phenology of 12 northern hybrid grape cultivars in central Iowa. Weather in Iowa varies greatly throughout the year, with average summer extreme highs of 96.4 °F and

Open access

annual life cycles of 12 cold-climate northern hybrid grape varieties in central Iowa. Across 7 years that ranged from warmer than average to much colder than average, four varieties showed ample hardiness, five were moderately vulnerable to late winter