Dahlia rosea
| Dahlia rosea | |
| Light: |  |
| Moisture: |  |
| Hardiness: | 9 |
| Soil pH: | 5.6-8.4 |
| Height: | 5' |
| Blooms: | Late Summer-Mid Fall |
| Native to: | |
| Edible Rating: |  |
| Medicinal Rating: |  |
| Tea: | Yes |
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Dahlia rosea (common name: dahlia)
Propagation: Seed - sow late winter to mid spring in a greenhouse. The seed usually germinates in 1 - 3 weeks at 20°c[1]. When they are large enough to handle, prick the seedlings out into individual pots and grow them on in the greenhouse for at least their first winter. Plant them out into their permanent positions in late spring or early summer, after the last expected frosts.
Cuttings of young shoots in early spring. The tubers are usually brought into the greenhouse in late winter in order to encourage early growth and young basal shoots are removed as soon as they are large enough[2].
Division. The roots are usually harvested in the autumn. These can be divided into individual tubers when planting out in the spring. Each portion should have a growing point[2].
Cultivation: Requires a deep rich soil and a sunny position[3], disliking shade[2].
The growing plant is very frost-tender, though the tubers are somewhat hardier. However, these tubers are not reliably hardy if left in the ground over winter in Britain[2]. They are best harvested after the foliage is killed off by frost and then stored in a cool but frost-free place over the winter, planting out in April/May[2].
A parent of the cultivated garden dahlia[3]. There is some confusion over this name, this entry might refer to D. hortensis or D. pinnata[2].
Range: Southern N. America - Mexico.
Habitat: Pine-oak forests and sandy meadows to 1500 metres[4][5].
Edibility: The flower petals are used in salads[6].
Root - cooked and used as a vegetable[7][8]. A bitter flavour[2]. Inedible according to another report[6]. A sweet extract of the tuber, called 'dacopa', is used as a beverage or as a flavouring. It is mixed with hot or cold water and sprinkled on ice cream. Its naturally sweet mellow taste is said to combine the characteristics of coffee, tea and chocolate[9]. The root is rich in the starch inulin. Whilst not absorbed by the body, this starch can be converted into fructose, a sweetening substance suitable for diabetics to use[4][7].
Medicinal: A valuable and much needed drug was extracted from dahlia roots during the first world war[4]. No more information was given in the report[K].
Usage: Yellow and gold dyes are obtained from the flowers and seed heads[10].
Pollinators: Insects
Soil: Can grow in light, medium, and heavy soils.
Flower Type: Hermaphrodite
Links
References
- ↑ Bird, Alfred. Growing from Seed Volume 4. Thompson and Morgan, 1990.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 Huxley, Anthony. The New Royal Horticultural Society Dictionary of Gardening. MacMillan Press, 1992.
- ↑ 3.0 3.1 Chittendon, Fred. RHS Dictionary of Plants. Oxford University Press, 1951.
- ↑ 4.0 4.1 4.2 Grieve, Margaret. A Modern Herbal. Penguin, 1984.
- ↑ Pesman, M. Meet Flora Mexicana. Dale S King, 1962.
- ↑ 6.0 6.1 Hedrick, Ulysses. Sturtevant's Edible Plants of the World. Dover Publications, 1972.
- ↑ 7.0 7.1 Usher, George. A Dictionary of Plants Used by Man. Constable, 1974.
- ↑ Tanaka, Tyōzaburō. Tanaka's Cyclopaedia of Edible Plants of the World. Keigaku Publishing, 1976.
- ↑ Facciola, Stephen. Cornucopia - A Source Book of Edible Plants. Kampong Publications, 1990.
- ↑ Buchanan, Rita. A Weavers Garden.