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Summary
Physical Characteristics
Rhododendron maximum is an evergreen Shrub growing to 3.5 m (11ft 6in).
See above for USDA hardiness. It is hardy to UK zone 3. It is in leaf all year, in flower from June to July, and the seeds ripen in October. The species is hermaphrodite (has both male and female organs) and is pollinated by Bees.
Suitable for: light (sandy) and medium (loamy) soils and prefers well-drained soil. Suitable pH: mildly acid soils and can grow in very acid soils.
It can grow in semi-shade (light woodland). It prefers moist soil.
UK Hardiness Map
US Hardiness Map
Synonyms
R. procerum.
Plant Habitats
Woodland Garden Dappled Shade; Shady Edge;
Edible Uses
References More on Edible Uses
Medicinal Uses
Plants For A Future can not take any responsibility for any adverse effects from the use of plants. Always seek advice from a professional before using a plant medicinally.
Analgesic Antirheumatic Cardiac
The poulticed leaves are used to relieve arthritic pain, headaches etc[61, 222]. A decoction of the leaves is occasionally employed internally in domestic practice in the treatment of rheumatism[82, 257]. The leaves are taken internally in controlled dosage for the treatment of heart ailments[222]. Caution is advised, see the notes above on toxicity.
References More on Medicinal Uses
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Other Uses
Wood
Wood - fine-grained, hard, heavy, strong, rather brittle[46, 61, 82, 229]. It weighs 39lb per cubic foot[235]. Used for tool handles and as a boxwood (Buxus spp.) substitute in engraving[46, 61, 82, 229].
Special Uses
References More on Other Uses
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]. A pH between 4.5 and 5.5 is ideal[1]. Hardy to about -30°c[184]. 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].
References Carbon Farming Information and Carbon Sequestration Information
Temperature Converter
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Plant 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].
Other Names
If available other names are mentioned here
Native Range
NORTHERN AMERICA: Canada (Nova Scotia), United States (Connecticut, Maine, Massachusetts, New Hampshire, New Jersey, New York, Ohio, Pennsylvania, Rhode Island, Vermont, West Virginia, Alabama, Georgia, Kentucky, Maryland, North Carolina, South Carolina, Tennessee, Virginia)
Weed Potential
Right plant wrong place. We are currently updating this section.
Please note that a plant may be invasive in one area but may not in your area so it’s worth checking.
Conservation Status
IUCN Red List of Threatened Plants Status :
Growth: S = slow M = medium F = fast. Soil: L = light (sandy) M = medium H = heavy (clay). pH: A = acid N = neutral B = basic (alkaline). Shade: F = full shade S = semi-shade N = no shade. Moisture: D = dry M = Moist We = wet Wa = water.
Expert comment
Author
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Botanical References
1143200
Links / References
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