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Canna cultivars are grown in most countries, even those with territory above the Arctic Circle, which have short summers, but long days, and the rapid growth rate of cannas makes them a feasible gardening plant, as long as they receive 6–8 hours of sunlight each day during the growing season and are protected from the cold of winter.
Cultivars, F1 and F2 hybrids, normally with small species-like flowers, but grown principally for their foliage. [2] [3] [4] This group has occasionally been referred to as the Année Group, after the originator, Théodore Année, the world's first Canna hybridizer.
Herb up to 3 m with stout, erect stems. Leaves large, oblong, acuminate. Flowers 10–13 cm. (4-5") long, honeysuckle-scented, borne in a short, terminal raceme; perianth tubular, the three outer petaloid lobes linear-oblong, convolute, reflexed, tinged green, the three inner ones straight and extended, recurved at end, white, tinted yellowish-green.
Canna species have been categorised by two different taxonomists in the course of the last three decades. They are Paul Maas , from the Netherlands [ 1 ] [ 2 ] [ 3 ] and Nobuyuki Tanaka from Japan . [ 4 ]
Canna 'Yellow King Humbert' Burbank is a medium sized Italian Group Canna cultivar; foliage green, but often variegated purple markings and occasionally whole leaves purple, oval shaped, spreading habit; oval stems, coloured green + purple; flower clusters are open, spotted, colours yellow with red spots, often large red markings and occasionally whole flowers red, staminodes are large; seed ...
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Canna 'R. Wallace' is a medium sized, Crozy Group canna cultivar; green foliage, oblong shaped, white margin, spreading habit; round stems, coloured green; flowers are open, pale yellow with red spots, staminodes are large, edges regular, stamen is rose-red with small yellow flecks; fertile both ways, not self-pollinating or true to type, capsules round; rhizomes are thick, up to 3 cm in ...
E. robustus can reach 8–10 ft (2.4–3.0 m) in height with pink or white flower spikes E. stenophyllus , a dwarf species, reaches 2–3 ft (0.61–0.91 m) in height with yellow flowers. Also E . × isabellinus which is a hybrid of E. olgae and E. stenophyllus is available as 'Cleopatra', with orange spikes.