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Rhododendron griersonianum

Common name:		Family:	Ericaceae
Author:	Balf.f.& Forrest.	Botanical references:	200, 266
Synonyms:
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:	E. Asia - W. China to Burma.
Habitat:	Coniferous and mixed forests, also in scrub, 2150 - 2700 metres in W. Yunnan[184].
Edibility Rating (1-5):	0	Medicinal Rating (1-5):	0

Systematics:	From a USDA Plants Database
	Order: Ericales. Heath family

Physical Characteristics

An evergreen shrub growing to 3m. It is hardy to zone 8. It is in leaf all year, in flower from May to June, and the seeds ripen in March. The flowers are hermaphrodite (have both male and female organs). We rate it 0/5 for edibility and 0/5 for medicinal use.

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

Habitats and Possible Locations

Hedge, Woodland, Dappled Shade, Shady Edge.

Edible Uses

None known

Medicinal Uses

Disclaimer

None known

Other Uses

Hedge.

Plants can be grown as a hedge, responding well to trimming[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]. Succeeds in sun or shade, the warmer the climate the more shade a plant requires[200]. Tolerant of more sun and drought than most species in this genus[184]. A pH between 4.5 and 5.5 is ideal[200].
Hardy to about -10° c[184].
Plants are very tolerant of pruning, especially when grown in the milder areas of the country, and can be cut back severely if required[200].
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].
The seeds of this species take almost a year to ripen from flowering[266].
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

[G] Data (Common Names, Uses, Distribution) from the USDA/ARS NPGS's GRIN taxonomic database.
[HP] Links, Photos, Suppliers from Hortiplex Plant 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]).

[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.

[266] Flora of China 1994
On-line version of the Flora - an excellent resource giving basic info on habitat and some uses.

Readers Comments

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Plant information taken from the Plants For A Future - Species Database. Copyright (c) 1997-2003.
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