Northern Accents® ‘Lena’, ‘Ole’, ‘Sigrid’, and ‘Sven’: Four Cold-hardy Polyantha Rose Cultivars from the University of Minnesota Woody Landscape Plant Breeding Program

@article{Zuzek2016NorthernA,
  title={Northern Accents{\textregistered} ‘Lena’, ‘Ole’, ‘Sigrid’, and ‘Sven’: Four Cold-hardy Polyantha Rose Cultivars from the University of Minnesota Woody Landscape Plant Breeding Program},
  author={Kathy Zuzek and David C. Zlesak and Vance M. Whitaker and Steve McNamara and Stan C. Hokanson},
  journal={Hortscience},
  year={2016},
  volume={51},
  pages={296-299}
}
Roses are popular landscape plants valued for their beautiful and diverse floral displays that can be enjoyed throughout the majority of the growing season. Most of the landscape rose cultivars available today are not reliably winter hardy in U.S. Department of Agriculture (USDA) Plant Hardiness Zones 3 and 4 (USDA Plant Hardiness Zone Map, 2012). Susceptibility to rose black spot (Diplocarpon rosae F.A. Wolf) and other foliar diseases such as spot anthracnose [Sphaceloma rosarum (Pass.) Jenk… 
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