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Canna Agriculture Group
The Canna Agriculture Group contains all of the varieties of Canna used in agriculture. Canna achira is a generic term used in South America to describe the cannas that have been selectively bred for agricultural purposes, normally derived from C. discolor. It is grown especially for its edible rootstock from which starch is obtained, but the leaves and young seed are also edible, and achira was once a staple foodcrop in Peru and Ecuador.
Additional recommended knowledge
There are some named agricultural varieties, and published comparative studies have involved:
Many more traditional varieties exist world-wide, they have all involved human selection and so are classified as agricultural cultivars. Traditionally, Canna 'edulis' has been reputed to be the variety grown for food in South America, but there is no scientific evidence to substantiate the name. It is probable that edulis is simply a synonym of C. discolor, which is grown for agricultural purposes throughout Asia, refer Dr Tanaka.
In the Andes, the rhizome can be harvested within 6 months from planting out and the yields range from 13 - 85 tonnes per hectare, with 22 - 50 tonnes being average, though larger yields are obtained after 8 - 10 months.
Most cultivated forms do not produce fertile seed. There are also sterile triploid forms, these contain a significantly higher proportion of starch, though their cropping potential is not known.
The rhizomes and leaves are good fodder for cattle and pigs and it is grown for this purpose in Hawaii, where it is harvested 4-8 months after planting.
Canna is still grown for human consumption in the Andes and also in Vietnam and southern China, where the starch is used to make cellophane noodles.
Rootstock - actually a rhizome, this can be eaten either raw or cooked. It is the source of canna starch which is used as a substitute for arrowroot. The starch is obtained by rasping the rhizome to a pulp, then washing and straining to get rid of the fibres. This starch is very digestible. The very young rhizomes can also be eaten cooked, they are sweet but fibrousy. The rhizome can be very large, sometimes as long as a person's forearm. In Peru the rhizomes are baked for up to 12 hours by which time they become a white, translucent, fibrous and somewhat mucilaginous mass with a sweetish taste. The starch is in very large grains, about three times the size of potato starch grains, and can be seen with the naked eye. This starch is easily separated from the fibre of the rhizome.
Young shoots - these can be cooked and eaten as a green vegetable and are quite nutritious, containing at least 10% protein.
Seeds - the immature seeds are cooked in fat in tortillas.
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- "Colorful Cannas" By Cynthia W. Mueller, from the November-December 2001 issue of Horticulture Update
- PRINCE, LINDA M.* and W. JOHN KRESS. Smithsonian Institution, NMNH - Botany, MRC-166, Washington, DC 20560-0166. - Species boundaries in Canna (Cannaceae): evidence from nuclear ITS DNA sequence data.
- Plants for a Future.
- Reappraisal of Edible Canna as a High-Value Starch Crop in Vietnam
- The utilization of edible Canna plants in southeastern Asia and southern China
- On the Genus Canna in Yaeyama Islands, the Ryukyus, Japan
- Edible Canna and its Starch: An Under-Exploited Starch-Producing Plant Resource
- Progress in the Development of Economic Botany and Knowledge of Food Plants.
- Royal Botanic Gardens, Kew: World Checklist Series
- Polyploidy in Cannas
- More polyploidy in Cannas
- List of Canna species
- List of Canna cultivars
- List of Canna hybridists
- Canna Leaf Roller
- Canna virus
- Canna rust
- Japanese beetle