Canna 'Orange Perfection' is a tall Foliage Group cultivar, with green leaves and orange flowers.
Orange Popsicle requires research.
Orange Princess requires research.
Canna 'Orange Punch' is a medium-sized Crozy Group cultivar, with green leaves and orange flowers.
Orange Queen requires research.
Orange Ribbon requires research.
Orange Siranaut requires research.
Orange Sprite requires research.
Canna 'Orange Tiger' is a small Italian Group cultivar, with variegated leaves and orange flowers.
Canna 'Orange Vif' is a medium-sized Crozy Group cultivar, with green leaves and orange flowers.
Canna 'Orange Zest' is a small Crozy Group cultivar, with dark leaves and orange flowers.
Orangeade requires research.
Orangeman requires research.
Orchid is a synonym of City of Portland.
Canna 'Oriental' is a tall Crozy Group cultivar, with green leaves and yellow flowers.
orientalis Bouché is a synonym of indica var. indica.
orientalis f. flava Roscoe is a synonym of indica var. flava (Roscoe, Baker) Nb. Tanaka.
orientalis Roscoe requires research.
Oriflamme requires research.
Oriole requires research.