Canna 'jacobiniflora T. Koyama & Nb. Tanaka' is a small cultivar, with green leaves and red flowers.
Canna 'Jacobs Coat' is a medium-sized Foliage Group cultivar, with green leaves and multi-coloured flowers.
Canna 'Jadwiga' is a medium-sized Crozy Group cultivar, with green leaves and pink flowers.
Canna 'jaegeriana' is a giant species, with green leaves and orange flowers.
James Farquhar requires research.
Canna 'Japanese Green' is a tall Agriculture Group cultivar, with green leaves and red flowers.
Jarchewall requires research.
Canna 'Jarhondarh' is a medium-sized Crozy Group cultivar, with green leaves and yellow flowers.
Canna 'Jarluigi' is a medium-sized Crozy Group cultivar, with green leaves and white flowers.