Oceanus requires research.
Odysseus requires research.
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.
Omar Khayyám requires research.
Orange Assaut requires research.
Canna 'Orange Ballcap' is a medium-sized Crozy Group cultivar, with green leaves and orange flowers.
Orange Crush requires research.
Orange Princess requires research.
Orange Queen requires research.
Orange Siranaut requires research.
Orange Sprite requires research.
Orangeade requires research.
Orangeman requires research.
orientalis Roscoe requires research.
Oriflamme requires research.