Chinese Purple requires research.
Canna 'Chocolate Cherry' is a medium-sized cultivar, with dark leaves and red flowers.
Canna 'Chouchou' is a small Crozy Group cultivar, with green leaves and multi-coloured flowers.
Christ's Light is a synonym of Trinacria Variegata.
Canna 'Cinnabarina' is a medium-sized Crozy Group cultivar, with green leaves and red flowers.
Canna 'Cipières' is a medium-sized Crozy Group cultivar, with green leaves and red flowers.
Canna 'Circe' is a medium-sized Crozy Group cultivar, with green leaves and pink flowers.
Canna 'City of Gloucester' is a medium-sized Crozy Group cultivar, with dark leaves and pink flowers.
Canna 'City of Portland' is a medium-sized Crozy Group cultivar, with green leaves and pink flowers.
Claire requires research.
Canna 'Clans' is a medium-sized Crozy Group cultivar, with green leaves and red flowers.
Canna 'Clauda' is a medium-sized cultivar, with green leaves and red flowers.
Claude Bernard requires research.
Canna 'Cleopatra' is a medium-sized Italian Group cultivar, with variegated leaves and multi-coloured flowers.
Canna 'Cleopatré' is a small Crozy Group cultivar, with green leaves and orange flowers.
Canna 'Cloth of Gold' is a medium-sized Italian Group cultivar, with dark leaves and orange flowers.
coccinéa is a synonym of coccinea.
Coles Pale Superba requires research.
Colette requires research.
Canna 'Colibri' is a medium-sized Crozy Group cultivar, with green leaves and multi-coloured flowers.