compacta-grandiflora requires research.
Canna 'Compte de Bouchaud' is a medium-sized Crozy Group cultivar, with green leaves and multi-coloured flowers.
Comte de Ganay requires research.
Comte Horace de Choiseul requires research.
Canna 'Comtesse d'Hauteville' is a medium-sized Crozy Group cultivar, with dark leaves and red flowers.
Canna 'Comtesse de Bouchaud' is a medium-sized Crozy Group cultivar, with green leaves and multi-coloured flowers.
Canna 'Conestoga' is a medium-sized Conservatory Group cultivar, with green leaves and yellow flowers.
Canna 'Confetti' is a small Crozy Group cultivar, with green leaves and multi-coloured flowers.
Canna 'Confetti(2)' is a small Crozy Group cultivar, with green leaves and white flowers.
Canna 'Constitution' is a medium-sized Conservatory Group cultivar, with dark leaves and pink flowers.
Canna 'Copicana' is a medium-sized Crozy Group cultivar, with green leaves and orange flowers.
Canna 'Copper Giant' is a tall Crozy Group cultivar, with green leaves and red flowers.
Canna 'Copper Lode' is a medium-sized Crozy Group cultivar, with green leaves and multi-coloured flowers.
Coq d’Or is a synonym of Oiseau d'Or.
Canna 'Cora' is a medium-sized Crozy Group cultivar, with green leaves and pink flowers.
Canna 'Corail' is a small Crozy Group cultivar, with dark leaves and orange flowers.
Cornelius Cole requires research.
Canna 'Corrida' is a small Crozy Group cultivar, with green leaves and red flowers.
Canna 'Corsica' is a small Premier Group cultivar, with green leaves and multi-coloured flowers.
Canna 'Cosmopolitan' is a small Foliage Group cultivar, with green leaves and red flowers.