glauca var. rufa Hook requires research.
glauca var. siamensis (Kraenzl) Nb. Tanaka requires research.
Canna 'Glevum' is a medium-sized Crozy Group cultivar, with dark leaves and orange flowers.
Gloria is a synonym of CannaSun™ Gloria.
Canna 'Gnom' is a small Premier Group cultivar, with green leaves and pink flowers.
Canna 'Gold Cup' is a small Premier Group cultivar, with green leaves and yellow flowers.
Canna 'Golden Frills' is a small Crozy Group cultivar, with green leaves and yellow flowers.
Canna 'Golden Heart' is a medium-sized Crozy Group cultivar, with green leaves and multi-coloured flowers.
Canna 'Golden Orb' is a small Crozy Group cultivar, with dark leaves and yellow flowers.
Canna 'Goldilocks' is a medium-sized Premier Group cultivar, with green leaves and yellow flowers.
Canna 'Gozée' is a small Crozy Group cultivar, with green leaves and orange flowers.
Canna 'Gran Canaria' is a medium-sized Crozy Group cultivar, with green leaves and white flowers.
Canna 'Grand Duc' is a medium-sized Crozy Group cultivar, with dark leaves and orange flowers.
Canna 'Grandiflora floribunda' is a medium-sized Foliage Group cultivar, with green leaves and pink flowers.
Canna 'Grossherzog Ernst Ludwig von Hessen' is a medium-sized Crozy Group cultivar, with dark leaves and orange flowers.
Canna 'Guayaquilla' is a tall Foliage Group cultivar, with green leaves and orange flowers.
Canna 'Guttermanni' is a tall Foliage Group cultivar, with dark leaves and orange flowers.