Canna 'North Star Sweetheart' is a small Crozy Group cultivar, with green leaves and red flowers.
Nuance requires research.
Nuscantara requires research.
Canna 'Oberon' is a miniature Miniature Group cultivar, with green leaves and orange flowers.
occidentalis Roscoe is a synonym of indica var. indica.
Oceanus requires research.
Odysseus requires research.
Canna 'Oiseau d'Or' is a medium-sized Crozy Group cultivar, with green leaves and yellow flowers.
Canna 'Oiseau d'Or (Australia)' is a medium-sized Crozy Group cultivar, with green leaves and yellow flowers.
Canna 'Oiseau de Feu' is a medium-sized Crozy Group cultivar, with green leaves and red flowers.
Oklahoma_x000D_
Canna 'Oklahoma'
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see Mrs Alfred F. Conard_x000D_
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Canna 'Oklahoma' - see Mrs Alfred F. Conard
Canna 'Old Gold' is a medium-sized Crozy Group cultivar, with green leaves and orange flowers.
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Canna 'Old Red'
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see Mystique_x000D_
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Canna 'Old Red' - see Mystique
Old Rose Duchesse requires research.
Canna 'Oloha' is a small Crozy Group cultivar, with green leaves and orange flowers.
Olymphic requires research.
Olympia requires research.
Olympic requires research.