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Dahlia rosea - Cav.

Common Name Dahlia, Pinnate dahlia
Family Asteraceae or Compositae
USDA hardiness 8-11
Known Hazards None known
Habitats Pine-oak forests and sandy meadows to 1500 metres[4, 181].
Range Southern N. America - Mexico.
Edibility Rating  
Other Uses  
Weed Potential No
Medicinal Rating  
Care
Half Hardy Moist Soil Full sun
Dahlia rosea Dahlia, Pinnate dahlia


Dahlia rosea Dahlia, Pinnate dahlia

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Summary


Physical Characteristics

 icon of manicon of flower
Dahlia rosea is a PERENNIAL growing to 1.5 m (5ft).
It is hardy to zone (UK) 9 and is frost tender. It is in flower from Aug to October. The species is hermaphrodite (has both male and female organs) and are pollinated by Insects. Suitable for: light (sandy), medium (loamy) and heavy (clay) soils. Suitable pH: acid, neutral and basic (alkaline) soils. It cannot grow in the shade. It prefers moist soil.

Synonyms

Habitats

 Cultivated Beds;

Edible Uses

Edible Parts: Flowers;  Root.
Edible Uses: Condiment;  Sweetener.

The flower petals are used in salads[2]. Root - cooked and used as a vegetable[61, 105]. A bitter flavour[200]. Inedible according to another report[2]. 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[183]. 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, 61].

Medicinal Uses



Plants For A Future can not take any responsibility for any adverse effects from the use of plants. Always seek advice from a professional before using a plant medicinally.

Miscellany.

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].

Other Uses

Dye;  Miscellany.

Yellow and gold dyes are obtained from the flowers and seed heads[169].

Cultivation details

Requires a deep rich soil and a sunny position[1], disliking shade[200]. 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[200]. 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[200]. A parent of the cultivated garden dahlia[1]. There is some confusion over this name, this entry might refer to D. hortensis or D. pinnata[200].

Propagation

Seed - sow late winter to mid spring in a greenhouse. The seed usually germinates in 1 - 3 weeks at 20°c[164]. 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[200]. 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[200].

Other Names

If available other names are mentioned here

Found In

Countries where the plant has been found are listed here if the information is available

Weed Potential

Right plant wrong place. We are currently updating this section. Please note that a plant may be invasive in one area but may not in your area so it’s worth checking.

Conservation Status

IUCN Red List of Threatened Plants Status :

Related Plants
Latin NameCommon NameEdibility RatingMedicinal Rating
Coreopsis giganteaGiant coreopsis, Sea Dahlia00
Dahlia pinnataDahlia, Pinnate dahlia10

 

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Expert comment

Author

Cav.

Botanical References

200

Links / References

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Subject : Dahlia rosea  
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