Authors: Kathy Zuzek and Steve McNamara are horticultural scientists at the University of Minnesota Horticultural Research Center. Marcia Richards is a volunteer research assistant at the Center. Harold Pellett is a professor of horticultural science at the Minnesota Landscape Arboretum. The Arboretum and the Research Center are both located in Chanhassen, Minnesota.

Acknowledgements: The authors wish to gratefully acknowledge Deborah Brown, Sam Brungardt, Bob Mugaas, and Don Selinger for their comments on this manuscript. The authors also wish to acknowledge the staff and volunteers of the Minnesota Landscape Arboretum who helped maintain and evaluate the roses for this study.

Photo editing was by Dave Hansen of Communication and Educational Technology Services. Photography was by Dave Hansen, Kathy Zuzek, Marcia Richards, Steve McNamara and Jody Fetzer. Publication design was by Larry Etkin and John Molstad of Communication and Educational Technology Services. Illustrations and artwork were by John Molstad and Jeff Davel. Publication manuscript editing and product management for the Minnesota Agricultural Experiment Station was by Larry Etkin.

Production of this publication was supported with funds from the Minnesota Agricultural Experiment Station.