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Commelina coelestis

Common name:	Blue Spider Wort	Family:	Commelinaceae
Author:	Willd.	Botanical references:	200
Synonyms:
Known Hazards:	None known
Range:	Southern N. America - Mexico.
Habitat:	Not known
Edibility Rating (1-5):	2	Medicinal Rating (1-5):	0

Other Common Names:	From various places around the Web, may not be correct. See below.
	Commelina [P],
Epithets:	From a Dictionary of Botanical Epithets
	coelestis = sky blue;
Systematics:	From a USDA Plants Database
	Order: Commelinales. Spiderwort family
Other Range Info:	From the Ethnobotany Database
	Mexico

Physical Characteristics

Perennial growing to 0.45m by 0.3m . It is hardy to zone 9. It is in flower from July to September, and the seeds ripen from August to October. The flowers are hermaphrodite (have both male and female organs). We rate it 2/5 for edibility and 0/5 for medicinal use.

The plant prefers light (sandy) soils and requires well-drained soil. The plant prefers acid, neutral and basic (alkaline) soils. It cannot grow in the shade. It requires dry or moist soil and can tolerate drought.

Habitats and Possible Locations

Cultivated Beds, By Walls, By South Wall, By West Wall.

Edible Uses

Root.

Tubers - cooked[2]. Starchy[105]. The plant forms a clump of thin finger-shaped roots about 7 - 10cm long. These are easily harvested, though overall yields are low. The roots have a fairly bland flavour and an acceptable texture[K]. By no means a favourite root crop, but acceptable in small quantities[K].

Medicinal Uses

Disclaimer

None known

Other Uses

None known

Cultivation details

Prefers a light well-drained loam with added leafmold and a warm sunny position[42, 111, 190]. Established plants are drought tolerant[190].
A very ornamental plant[1], it is not very winter hardy in Britain so the roots are best dug up in autumn and stored like dahlias in a cool frost free place[1]. When grown in a light well-drained soil and mulched well, the roots usually survive the winter outdoors, at least in the milder areas of the country[111, K].
This plant is very attractive to slugs[K].

Propagation

Seed - sow March in a greenhouse. The seed usually germinates in 4 - 5 weeks at 20°c[164]. Prick the seedlings out into individual pots as soon as they are large enough to handle and plant out in late spring or early summer after the last expected frosts.
Division in early spring. The root clump consists of a number of finger-shaped roots joined together at their tops. When dividing this, it is important to ensure that each division has at least one growing bud at the top[111, K]. Pot up the divisions and grow them on in a greenhouse or cold frame until they are established and then plant them out in late spring, after the last expected frosts[K].
Cuttings during the growing season. These root very easily[200].

Suppliers

For more details of plant suppliers please see our Suppliers Page which lists many more places to look.

PFAF Web Pages

This plant is mentioned in the following web pages

Edible Ornamental Plants

Web References

[E] Ethnobotany Data (common names, uses, countries) from the Ethnobotany Database.
[G] Data (Common Names, Uses, Distribution) from the USDA/ARS NPGS's GRIN taxonomic database.
[P] Data. (uses, distribution, wetland) from the USDA'a Plants database.
[HP] Links, Photos, Suppliers from Hortiplex Plant Database

References for the family Commelinaceae.

[CHINA] Data Very detailed botanical/identification info. from the Flora of China.

See the PFAF Links Pages for other sources.

Also try Photos and info from the The Plants Database which has 14,000 images.

References

[K] Ken Fern
Notes from observations, tasting etc at Plants For A Future and on field trips.

[1] F. Chittendon. RHS Dictionary of Plants plus Supplement. 1956 Oxford University Press 1951
Comprehensive listing of species and how to grow them. Somewhat outdated, it has been replaces in 1992 by a new dictionary (see [200]).

[2] Hedrick. U. P. Sturtevant's Edible Plants of the World. Dover Publications 1972 ISBN 0-486-20459-6
Lots of entries, quite a lot of information in most entries and references.

[42] Grey. C. H. Hardy Bulbs. Williams & Norgate. 1938
Rather dated now, but an immense work on bulbs for temperate zones and how to grow them. Three large volumes.

[105] Tanaka. T. Tanaka's Cyclopaedia of Edible Plants of the World. Keigaku Publishing 1976
The most comprehensive guide to edible plants I've come across. Only the briefest entry for each species, though, and some of the entries are more than a little dubious. Not for the casual reader.

[111] Sanders. T. W. Popular Hardy Perennials. Collingridge 1926
A fairly wide range of perennial plants that can be grown in Britain and how to grow them.

[164] Bird. R. (Editor) Growing from Seed. Volume 4. Thompson and Morgan. 1990
Very readable magazine with lots of information on propagation. A good article on Yuccas, one on Sagebrush (Artemesia spp) and another on Chaerophyllum bulbosum.

[190] Chatto. B. The Dry Garden. Dent 1982 ISBN 0460045512
A good list of drought resistant plants with details on how to grow them.

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

Readers Comments

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Plant information taken from the Plants For A Future - Species Database. Copyright (c) 1997-2003.
WEB search engine by Rich Morris - Home Page- Contact Info
Blagdon Cross, Ashwater, Beaworthy, Devon, EX21 5DF, UK.
Website: www.pfaf.org Phone: 0845 458 4719/_44(0) 1208 872963

This page (UK) http://www.comp.leeds.ac.uk/cgi-bin/pfaf/arr_html?Commelina+coelestis
This page (US) http://www.ibiblio.org/pfaf/cgi-bin/arr_html?Commelina+coelestis

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We make no claims of magical effects or supernatural powers for any item in this catalog. In spite of legendary attributes or occult and craft tradition, such items are offered as curios only and beliefs concerning their magical effectiveness are related only for historical interest.