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Rhododendron ponticum

Common name:	Rhododendron	Family:	Ericaceae
Author:	L.	Botanical references:	11, 17, 200
Synonyms:	Rhododendron speciosum ((Willd.)Sweet.), Rhododendron lancifolium (Moench.)
Known Hazards:	Although no specific mention of toxicity has been seen for this species, it belongs to a genus where many members have poisonous leaves. The pollen of many if not all species of rhododendrons is also probably toxic, being said to cause intoxication when eaten in large quantities[183].
Range:	W. Europe to the Caucasus and Lebanon. Naturalized in Britain[17].
Habitat:	Rich forests under Fagus, Picea and Abies species, it is also found above the tree line[11]. Sandy and peaty soils in woods and open places in Britain[17].
Edibility Rating (1-5):	0	Medicinal Rating (1-5):	1

Other Possible Synonyms:	From various places across the web, may not be correct. See below.
	Azalea speciosa[B,P] R. flammeum[B,P]
Other Common Names:	From various places around the Web, may not be correct. See below.
	Azalia [E], Piedmont Azalea [B,P], Pontische Rododendron [D],
Epithets:	From a Dictionary of Botanical Epithets
	ponticum = Pontus, Turkey
Systematics:	From a USDA Plants Database
	Order: Ericales. Heath family
Other Range Info:	From the Ethnobotany Database
	Turkey

Physical Characteristics

An evergreen shrub growing to 5m. It is hardy to zone 7. It is in leaf all year, in flower from May to June. The flowers are hermaphrodite (have both male and female organs) and are pollinated by Insects. We rate it 0/5 for edibility and 1/5 for medicinal use.

The plant prefers light (sandy) and medium (loamy) soils and requires well-drained soil. The plant prefers acid soils and can grow in very acid soil. It can grow in semi-shade (light woodland). It requires moist soil.

Habitats and Possible Locations

Hedge, Woodland, Dappled Shade, Shady Edge.

Edible Uses

None known

Medicinal Uses

Disclaimer

Cardiac.

A medicine made from the plant is used to treat heart and circulation malfunctions, but it should not be used without expert supervision[9].

Other Uses

Hedge.

Plants are being grown as a hedge at the RHS gardens in Wisley, Surrey[29]. It tolerates quite hard clipping[200].

Cultivation details

Succeeds in a most humus-rich lime-free soils except those of a dry arid nature or those that are heavy or clayey[1]. Prefers a peaty or well-drained sandy loam[1]. A pH between 4.5 and 5.5 is ideal[1]. Succeeds in sun or shade, the warmer the climate the more shade a plant requires[184, 200].
Hardy to about -15° c[184].
Plants are self-sowing aggressively in British woodlands and are often out-competing native trees by filling the understorey and preventing natural regeneration. They are considered to be a pernicious weed by many environmentalists.
Succeeds in a woodland though, because of its surface-rooting habit[200], it does not compete well with surface-rooting trees[1]. Plants need to be kept well weeded, they dislike other plants growing over or into their root system, in particular they grow badly with ground cover plants, herbaceous plants and heathers[200].
Plants form a root ball and are very tolerant of being transplanted, even when quite large, so long as the root ball is kept intact[200].
Plants in this genus are notably susceptible to honey fungus[200].

Propagation

Seed - best sown in a greenhouse as soon as it is ripe in the autumn and given artificial light. Alternatively sow the seed in a lightly shaded part of the warm greenhouse in late winter or in a cold greenhouse in April. Surface-sow the seed and do not allow the compost to become dry[200]. Pot up the seedlings when they are large enough to handle and grow on in a greenhouse for at least the first winter.
Layering in late July. Takes 15 - 24 months[78].
Cuttings of half-ripe wood, August in a frame. Difficult[78].

Suppliers

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

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.
[PHARM] Phytochemical Data (common names, uses, countries) from Dr Duke's Phytochemical Database.
[HP] Links, Photos, Suppliers from Hortiplex Plant Database

References for Rhododendron flammeum (a possible synonym).

[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.
[P] Data. (uses, distribution, wetland) from the USDA'a Plants database.
[P] Data. (uses, distribution, wetland) from the USDA'a Plants database.

References for the family Ericaceae.

[CHINA] Draft Data for parts of family 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

[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]).

[9] Launert. E. Edible and Medicinal Plants. Hamlyn 1981 ISBN 0-600-37216-2
Covers plants in Europe. a drawing of each plant, quite a bit of interesting information.

[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.

[17] Clapham, Tootin and Warburg. Flora of the British Isles. Cambridge University Press 1962
A very comprehensive flora, the standard reference book but it has no pictures.

[29] Shepherd. F.W. Hedges and Screens. Royal Horticultural Society. 1974 ISBN 0900629649
A small but informative booklet giving details of all the hedging plants being grown in the R.H.S. gardens at Wisley in Surrey.

[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.

[183] Facciola. S. Cornucopia - A Source Book of Edible Plants. Kampong Publications 1990 ISBN 0-9628087-0-9
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.

[184] Phillips. R. & Rix. M. Shrubs. Pan Books 1989 ISBN 0-330-30258-2
Excellent photographs and a terse description of 1900 species and cultivars.

[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
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