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Useful Tropical Plants

Dahlia pinnata

Cav.

Asteraceae

+ Synonyms

Coreopsis georgina Cass.

Dahlia purpurea Poir.

Dahlia rosea Cav.

Dahlia sambucifolia Salisb.

Dahlia superflua (DC.) W.T.Aiton

Dahlia variabilis (Willd.) Desf.

Georgia superflua DC.

Georgia variabilis Willd.

Georgina superflua DC.

Georgina variabilis Willd.

Common Name: Dahlia

Dahlia pinnata
Flowering plant
Photograph by: Denis Conrado
Creative Commons Attribution-Share Alike 3.0
Dahlia pinnata Dahlia pinnata

General Information

Dahlia pinnata is a herbaceous perennial plant producing stems up to 1.5 metres tall from a tuberous rootstock.
The plant is sometimes harvested from the wild for local use as a food and dye. It is one of the parents of the cultivated Dahlias that are so commonly grown as ornamentals.

Known Hazards

None known

Botanical References

200
Title
The New RHS Dictionary of Gardening. 1992.
Publication
 
Author
Huxley. A.
Publisher
MacMillan Press
Year
1992
ISBN
0-333-47494-5
Description
Excellent and very comprehensive, though it contains a number of silly mistakes. Readable yet also very detailed.

Range

Southern N. America - Mexico. Naturalised in much of Central America.

Habitat

Rich damp oak and pine woods at elevations around 1,800 metres[
260
Title
Conservatory and Indoor Plants Volumes 1 & 2
Publication
 
Author
Phillips. R. & Rix. M.
Publisher
Pan Books, London.
Year
1998
ISBN
0-330-37376-5
Description
Excellent photos of over 1,100 species and cultivars with habits and cultivation details plus a few plant uses. Many species are too tender for outdoors in Britain though there are many that can be grown outside.
].

Properties

Edibility Rating *  *
Other Uses Rating *  *
HabitPerennial
Height1.00 m
PollinatorsInsects
Cultivation StatusWild

Cultivation Details

The growing plant is very frost-tender, though the tubers are somewhat hardier tolerating temperatures down to about -5°c[
260
Title
Conservatory and Indoor Plants Volumes 1 & 2
Publication
 
Author
Phillips. R. & Rix. M.
Publisher
Pan Books, London.
Year
1998
ISBN
0-330-37376-5
Description
Excellent photos of over 1,100 species and cultivars with habits and cultivation details plus a few plant uses. Many species are too tender for outdoors in Britain though there are many that can be grown outside.
].
An easily grown plant so long as the soil does not dry out[
260
Title
Conservatory and Indoor Plants Volumes 1 & 2
Publication
 
Author
Phillips. R. & Rix. M.
Publisher
Pan Books, London.
Year
1998
ISBN
0-330-37376-5
Description
Excellent photos of over 1,100 species and cultivars with habits and cultivation details plus a few plant uses. Many species are too tender for outdoors in Britain though there are many that can be grown outside.
]. It requires a deep rich soil and a sunny position[
164
Title
Growing from Seed. Volume 4.
Publication
 
Author
Bird. R. (Editor)
Publisher
Thompson and Morgan.
Year
1990
ISBN
-
Description
Very readable magazine with lots of information on propagation. A good article on Yuccas, one on Sagebrush (Artemesia spp) and another on Chaerophyllum bulbosum.
], disliking shade[
200
Title
The New RHS Dictionary of Gardening. 1992.
Publication
 
Author
Huxley. A.
Publisher
MacMillan Press
Year
1992
ISBN
0-333-47494-5
Description
Excellent and very comprehensive, though it contains a number of silly mistakes. Readable yet also very detailed.
].

Edible Uses

The flower petals are used in salads[
177
Title
Plants for Human Consumption.
Publication
 
Author
Kunkel. G.
Publisher
Koeltz Scientific Books
Year
1984
ISBN
3874292169
Description
An excellent book for the dedicated. A comprehensive listing of Latin names with a brief list of edible parts.
,
301
Title
Cornucopia II
Publication
 
Author
Facciola. S.
Publisher
Kampong Publications, California.
Year
1998
ISBN
0-9628087-2-5
Description
The second edition of an excellent guide to the edible uses of plants, though it does not give any details of cultivation etc.
].

Root - cooked and used as a vegetable[
183
Title
Cornucopia - A Source Book of Edible Plants.
Publication
 
Author
Facciola. S.
Publisher
Kampong Publications
Year
1990
ISBN
0-9628087-0-9
Description
Excellent. Contains a very wide range of conventional and unconventional food plants (including tropical) and where they can be obtained (mainly N. American nurseries but also research institutes and a lot of other nurseries from around the world.
]. A bitter flavour[
200
Title
The New RHS Dictionary of Gardening. 1992.
Publication
 
Author
Huxley. A.
Publisher
MacMillan Press
Year
1992
ISBN
0-333-47494-5
Description
Excellent and very comprehensive, though it contains a number of silly mistakes. Readable yet also very detailed.
]. 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
Title
Cornucopia - A Source Book of Edible Plants.
Publication
 
Author
Facciola. S.
Publisher
Kampong Publications
Year
1990
ISBN
0-9628087-0-9
Description
Excellent. Contains a very wide range of conventional and unconventional food plants (including tropical) and where they can be obtained (mainly N. American nurseries but also research institutes and a lot of other nurseries from around the world.
]. 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[
141
Title
Alternative Enterprises for Agriculture in the UK.
Publication
 
Author
Carruthers. S. P. (Editor)
Publisher
Centre for Agricultural Strategy, Univ. of Reading
Year
1986
ISBN
0704909820
Description
Some suggested alternative commercial crops for Britain. Readable. Produced by a University study group.
,
171
Title
Economic Botany.
Publication
 
Author
Hill. A. F.
Publisher
The Maple Press
Year
1952
ISBN
-
Description
Not very comprehensive, but it is quite readable and goes into some detail about the plants it does cover.
].

Medicinal

None known

Other Uses

An orange dye is obtained from the flowers and seed heads[
168
Title
Nature's Colors - Dyes from Plants.
Publication
 
Author
Grae. I.
Publisher
MacMillan Publishing Co. New York.
Year
1974
ISBN
0-02-544950-8
Description
A very good and readable book on dyeing.
,
169
Title
A Weavers Garden.
Publication
 
Author
Buchanan. R.
Publisher
McGraw-Hill Contemporary
Year
1987
ISBN
0934026289
Description
Covers all aspects of growing your own clothes, from fibre plants to dyes.
].

Propagation

Seed - usually germinates in 1 - 3 weeks at 20°c[
164
Title
Growing from Seed. Volume 4.
Publication
 
Author
Bird. R. (Editor)
Publisher
Thompson and Morgan.
Year
1990
ISBN
-
Description
Very readable magazine with lots of information on propagation. A good article on Yuccas, one on Sagebrush (Artemesia spp) and another on Chaerophyllum bulbosum.
]. When they are large enough to handle, prick the seedlings out into individual pots and grow them on until large enough to plant out.
Cuttings of young shoots as new growth begins.
Division of the tubers when dormant. Each portion should have a growing point[
200
Title
The New RHS Dictionary of Gardening. 1992.
Publication
 
Author
Huxley. A.
Publisher
MacMillan Press
Year
1992
ISBN
0-333-47494-5
Description
Excellent and very comprehensive, though it contains a number of silly mistakes. Readable yet also very detailed.
].

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