Gustave Bruchet requires research.
Gustave Grunerwald requires research.
Gustave Sennholz requires research.
Canna 'Guttermanni' is a tall Foliage Group cultivar, with dark leaves and orange flowers.
H. Seidler requires research.
H. Wendland requires research.
Canna 'H.W. Coles' is a medium-sized Premier Group cultivar, with green leaves and orange flowers.
Halley's Comet requires research.
Canna 'Hallow' is a small Premier Group cultivar, with green leaves and multi-coloured flowers.
Halloween requires research.
Canna 'Hannah Dalebø-Wood' is a medium-sized Premier Group cultivar, with dark leaves and pink flowers.
Hans Werdmuller requires research.
Hansestadt Hamburg requires research.
Canna 'Happy Carmen' is a small Crozy Group cultivar, with green leaves and red flowers.
Canna 'Happy Cleo' is a small Crozy Group cultivar, with green leaves and orange flowers.
Happy Donna requires research.
Canna 'Happy Emily' is a small, with green leaves and yellow flowers.
Canna 'Happy Isabel' is a small, with green leaves and pink flowers.
Canna 'Happy Julia' is a miniature Crozy Group cultivar, with dark leaves and pink flowers.
Happy Valerie requires research.