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Uses

Toxic parts

The leaves are poisonous[1]. Ingestion can cause convulsions and coma[1]. The pollen of many if not all species of rhododendrons is also probably toxic, being said to cause intoxication when eaten in large quantities[2].

Edible uses

There are no edible uses listed for Rhododendron maximum.

Material uses

Wood - fine-grained, hard, heavy, strong, rather brittle[3][4][5][6]. It weighs 39lb per cubic foot[7]. Used for tool handles and as a boxwood (Buxus spp.) substitute in engraving[3][4][5][6].

Unknown part

Medicinal uses(Warning!)

The poulticed leaves are used to relieve arthritic pain, headaches etc[4][1]. A decoction of the leaves is occasionally employed internally in domestic practice in the treatment of rheumatism[5][8]. The leaves are taken internally in controlled dosage for the treatment of heart ailments[1]. Caution is advised, see the notes above on toxicity.

Ecology

Ecosystem niche/layer

Ecological Functions

Nothing listed.

Forage

Nothing listed.

Shelter

Nothing listed.

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[9]. 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[10].

Cuttings of half-ripe wood, August in a frame. Difficult[10].

Practical Plants is currently lacking information on propagation instructions of Rhododendron maximum. Help us fill in the blanks! Edit this page to add your knowledge.



Cultivation

Succeeds in a most humus-rich lime-free soils except those of a dry arid nature or those that are heavy or clayey[11]. Prefers a peaty or well-drained sandy loam[11]. Succeeds in sun or shade, the warmer the climate the more shade a plant requires[9]. A pH between 4.5 and 5.5 is ideal[11].

Hardy to about -30°c[12]. Succeeds in a woodland though, because of its surface-rooting habit[9], it does not compete well with surface-rooting trees[11]. 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[9]. 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[9].

Plants in this genus are notably susceptible to honey fungus[9].

Crops

Problems, pests & diseases

Associations & Interactions

There are no interactions listed for Rhododendron maximum. Do you know of an interaction that should be listed here? edit this page to add it.

Polycultures & Guilds

There are no polycultures listed which include Rhododendron maximum.

Descendants

Cultivars

Varieties

None listed.

Subspecies

None listed.

Full Data

This table shows all the data stored for this plant.

Taxonomy
Binomial name
Rhododendron maximum
Genus
Rhododendron
Family
Ericaceae
Imported References
Edible uses
Medicinal uses
Material uses & Functions
Botanic
Propagation
Cultivation
Environment
Cultivation
Uses
Edible uses
None listed.
Material uses
None listed.
Medicinal uses
None listed.
Functions & Nature
Functions
Provides forage for
Provides shelter for
Environment
Hardiness Zone
3
Heat Zone
?
Water
moderate
Sun
Shade
partial shade
Soil PH
Soil Texture
Soil Water Retention
Environmental Tolerances
    Ecosystems
    Native Climate Zones
    None listed.
    Adapted Climate Zones
    None listed.
    Native Geographical Range
    None listed.
    Native Environment
    None listed.
    Ecosystem Niche
    None listed.
    Root Zone Tendancy
    None listed.
    Life
    Deciduous or Evergreen
    Herbaceous or Woody
    Life Cycle
    Growth Rate
    ?
    Mature Size
    Fertility
    ?
    Pollinators
    Flower Colour
    ?
    Flower Type

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    References

    1. ? 1.01.11.21.31.4 Foster. S. & Duke. J. A. A Field Guide to Medicinal Plants. Eastern and Central N. America. Houghton Mifflin Co. ISBN 0395467225 (1990-00-00)
    2. ? Facciola. S. Cornucopia - A Source Book of Edible Plants. Kampong Publications ISBN 0-9628087-0-9 (1990-00-00)
    3. ? 3.03.13.2 Uphof. J. C. Th. Dictionary of Economic Plants. Weinheim (1959-00-00)
    4. ? 4.04.14.24.34.4 Usher. G. A Dictionary of Plants Used by Man. Constable ISBN 0094579202 (1974-00-00)
    5. ? 5.05.15.25.35.4 Sargent. C. S. Manual of the Trees of N. America. Dover Publications Inc. New York. ISBN 0-486-20278-X (1965-00-00)
    6. ? 6.06.16.2 Elias. T. The Complete Trees of N. America. Field Guide and Natural History. Van Nostrand Reinhold Co. ISBN 0442238622 (1980-00-00)
    7. ? 7.07.1 Britton. N. L. Brown. A. An Illustrated Flora of the Northern United States and Canada Dover Publications. New York. ISBN 0-486-22642-5 (1970-00-00)
    8. ? 8.08.1 Moerman. D. Native American Ethnobotany Timber Press. Oregon. ISBN 0-88192-453-9 (1998-00-00)
    9. ? 9.09.19.29.39.49.59.6 Huxley. A. The New RHS Dictionary of Gardening. 1992. MacMillan Press ISBN 0-333-47494-5 (1992-00-00)
    10. ? 10.010.1 Sheat. W. G. Propagation of Trees, Shrubs and Conifers. MacMillan and Co (1948-00-00)
    11. ? 11.011.111.211.3 F. Chittendon. RHS Dictionary of Plants plus Supplement. 1956 Oxford University Press (1951-00-00)
    12. ? Phillips. R. & Rix. M. Shrubs. Pan Books ISBN 0-330-30258-2 (1989-00-00)
    13. ? Cite error: Invalid <ref> tag; no text was provided for refs named PFAFimport-11
    14. ? Fernald. M. L. Gray's Manual of Botany. American Book Co. (1950-00-00)

    "image:Rhododendron maximum flowers 8601.JPG|248px" cannot be used as a page name in this wiki.

    Facts about "Rhododendron maximum"RDF feed
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    Article requires citationsNo +
    Article requires cleanupYes +
    Belongs to familyEricaceae +
    Belongs to genusRhododendron +
    Has binomial nameRhododendron maximum +
    Has common nameRosebay Rhododendron +
    Has drought toleranceIntolerant +
    Has fertility typeBees +
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    Has hardiness zone3 +
    Has imageRhododendron maximum flowers 8601.JPG +
    Has lifecycle typePerennial +
    Has material partUnknown part +
    Has material useWood +
    Has mature height3.5 +
    Has medicinal partUnknown part +
    Has medicinal useAnalgesic +, Antirheumatic + and Cardiac +
    Has primary imageRhododendron maximum flowers 8601.JPG +
    Has search namerhododendron maximum + and rosebay rhododendron +
    Has shade tolerancePartial shade +
    Has soil ph preferenceVery acid + and Acid +
    Has soil texture preferenceSandy + and Loamy +
    Has soil water retention preferenceWell drained +
    Has taxonomic rankSpecies +
    Has taxonomy nameRhododendron maximum +
    Has water requirementsmoderate +
    Is deciduous or evergreenEvergreen +
    Is herbaceous or woodyWoody +
    Is taxonomy typeSpecies +
    PFAF cultivation notes migratedNo +
    PFAF edible use notes migratedYes +
    PFAF material use notes migratedNo +
    PFAF medicinal use notes migratedNo +
    PFAF propagation notes migratedNo +
    PFAF toxicity notes migratedNo +
    Tolerates nutritionally poor soilNo +
    Uses mature size measurement unitMeters +
    Has subobjectThis property is a special property in this wiki.Rhododendron maximum +, Rhododendron maximum +, Rhododendron maximum + and Rhododendron maximum +