Canna 'Ulrich Brunner' is a medium-sized Crozy Group cultivar, with green leaves and red flowers.
Canna 'Una' is a medium-sized Crozy Group cultivar, with green leaves and pink flowers.
Canna 'Uncle Sam' is a tall Italian Group cultivar, with green leaves and orange flowers.
Canna 'Unique' is a medium-sized Foliage Group cultivar, with green leaves and orange flowers.
Canna 'Upton' is a small Crozy Group cultivar, with green leaves and orange flowers.
Uranus requires research.
Canna 'Uvurderlig' is a medium-sized Foliage Group cultivar, with green leaves and red flowers.