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Ceanothus impressus

Common name:	Santa Barbara Ceanothus	Family:	Rhamnaceae
Author:	Trel.	Botanical references:	11, 200
Synonyms:	Ceanothus dentatus impressus ((Trel.)Trel.)
Known Hazards:	None known
Range:	South-western N. America - coastal California.
Habitat:	Grows in chapparal plant communities from sea level to elevations of 200 metres[276].
Edibility Rating (1-5):	0	Medicinal Rating (1-5):	0

Other Common Names:	From various places around the Web, may not be correct. See below.
	Californian Lilac [H], Santa Barbara Buckbrush [B], Santa Barbara Ceanothus [P],
Systematics:	From a USDA Plants Database
	Order: Rhamnales. Buckthorn family

Physical Characteristics

An evergreen shrub growing to 1.5m by 1.5m . It is hardy to zone 7. It is in leaf all year, in flower from April to May. The flowers are hermaphrodite (have both male and female organs). It can fix Nitrogen. We rate it 0/5 for edibility and 0/5 for medicinal use.

The plant prefers light (sandy) and medium (loamy) soils and requires well-drained soil. The plant prefers acid, neutral and basic (alkaline) soils. It can grow in semi-shade (light woodland) or no shade. It requires dry or moist soil.

Habitats and Possible Locations

Woodland, Cultivated Beds, Sunny Edge.

Cultivar 'Puget Blue': Woodland, Cultivated Beds, Sunny Edge.

Edible Uses

None known

Medicinal Uses

Disclaimer

None known

Other Uses

Dye Soap.

A green dye is obtained from the flowers[168].
All parts of the plant are rich in saponins - when crushed and mixed with water they produce a good lather which is an effective and gentle soap[168, 169]. This soap is very good at removing dirt, though it does not remove oils very well. This means that when used on the skin it will not remove the natural body oils, but nor will it remove engine oil etc[K] The flowers are a very good source, when used as a body soap they leave behind a pleasant perfume on the skin[K]. The developing seed cases are also a very good source of saponins[K].

Cultivation details

Prefers a warm sunny position but tolerates light shade[11, 200]. Tolerates some lime, but will not succeed on shallow chalk[200].
Plants are hardy to about -10° c[200], they succeed in the open in the milder parts of the country but are best grown by a sunny wall in colder areas[11].
This is one of the hardiest and most satisfactory of the evergreen members of the genus in Britain[11]. It is a fast-growing species that can flower in 2 years from seed[200]. The cultivar 'Puget Blue' is very vigorous and flowers freely, though it is likely to be of hybrid origin.
This species is closely related to C. dentatus[11]. Hybridizes freely with other members of this genus[200].
Plants dislike root disturbance, they should be planted out into their permanent positions whilst still small[182].
Dislikes heavy pruning, it is best not to cut out any wood thicker than a pencil[182].
Some members of this genus have a symbiotic relationship with certain soil micro-organisms, these form nodules on the roots of the plants and fix atmospheric nitrogen. Some of this nitrogen is utilized by the growing plant but some can also be used by other plants growing nearby[200, 212].

Propagation

Seed - best sown as soon as it is ripe in a cold frame. Stored seed should be pre-soaked for 12 hours in warm water and then given 1 - 3 months stratification at 1° c[138, 200]. Germination usually takes place in 1 - 2 months at 20° c[138]. One report says that the seed is best given boiling water treatment, or heated in 4 times its volume of sand at 90 - 120° c for 4 - 5 minutes and then soaked in warm water for 12 hours before sowing it[214]. The seed exhibits considerable longevity, when stored for 15 years in an air-tight dry container at 1 - 5° c it has shown little deterioration in viability[214]. The seed is ejected from its capsule with some force when fully ripe, timing the collection of seed can be difficult because unless collected just prior to dehiscence the seed is difficult to extract and rarely germinates satisfactorily[214]. Prick out the seedlings into individual pots as soon as they are large enough to handle. Grow them on in the greenhouse for at least their first winter and plant them out into their permanent positions in late spring or early summer.
Cuttings of half-ripe wood, taken at a node[200], July/August in a frame[11].
Cuttings of mature wood of the current year's growth, 7 - 12 cm with a heel, October in a cold frame[78]. The roots are quite brittle and it is best to pot up the callused cuttings in spring, just before the roots break[78]. Good percentage.

Cultivars

'Puget Blue': A very vigorous cultivar that flowers freely, though it is likely to be of hybrid origin.

Suppliers

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

Web References

[H] Details of Scandanavian and European Common names in Henriette's names database
[B] Data (Latin & Common names, other references) from the BONAP's Synonymized Checklist of the Vascular Flora of the United States, Puerto Rico, and the Virgin Islands.
[C] Taxon data. from the CalFlora 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 Rhamnaceae.

To be included in 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.

[11] Bean. W. Trees and Shrubs Hardy in Great Britain. Vol 1 - 4 and Supplement. Murray 1981
A classic with a wealth of information on the plants, but poor on pictures.

[78] Sheat. W. G. Propagation of Trees, Shrubs and Conifers. MacMillan and Co 1948
A bit dated but a good book on propagation techniques with specific details for a wide range of plants.

[138] Bird. R. (Editor) Growing from Seed. Volume 3. Thompson and Morgan. 1989
Very readable magazine with lots of information on propagation.

[168] Grae. I. Nature's Colors - Dyes from Plants. MacMillan Publishing Co. New York. 1974 ISBN 0-02-544950-8
A very good and readable book on dyeing.

[169] Buchanan. R. A Weavers Garden.
Covers all aspects of growing your own clothes, from fibre plants to dyes.

[182] Thomas. G. S. Ornamental Shrubs, Climbers and Bamboos. Murray 1992 ISBN 0-7195-5043-2
Contains a wide range of plants with a brief description, mainly of their ornamental value but also usually of cultivation details and varieties.

[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.

[212] Craighead. J., Craighead. F. and Davis. R. A Field Guide to Rocky Mountain Wildflowers The Riverside Press 1963 ISBN 63-7093
Excellent little pocket guide to the area, covering 590 species and often giving details of their uses.

[214] Matthews. V. The New Plantsman. Volume 1, 1994. Royal Horticultural Society 1994 ISBN 1352-4186
A quarterly magazine, it has articles on Himalayacalamus hookerianus, hardy Euphorbias and an excellent article on Hippophae spp.

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.
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