Rhododendron yakushimanum Grumpy
Rhododendron yakushimanum Grumpy
Rhododendron yakushimanum Grumpy
Yakushima Rhododendron, Yakushimanum Rhododendron
Fast delivery. Very careful packaging. Young plant well developed, visibly very healthy (with many buds). Thank you very much.
Françoise, 08/03/2020
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This plant carries a 24 months recovery warranty
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We guarantee the quality of our plants for a full growing cycle, and will replace at our expense any plant that fails to recover under normal climatic and planting conditions.
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Description
Rhododendron 'Grumpy' is a hybrid of the Japanese species yakushimanum, from which it inherited its compact habit, abundant flowering, and robustness. It is a dwarf evergreen bush that is easy to cultivate and maintain. It will surprise you with its spring flowering in delicate shades of pale pink, salmon orange, and creamy yellow.
Derived from the cross between Rhododendron yakushimanum and an unknown hybrid, the Rhododendron 'Grumpy' forms a dense bush with a slightly spreading rounded habit, reaching 80cm (32in) in height and 120cm (47in) in width at maturity. Its matte green elliptical leaves provide good coverage. They have a very fuzzy brown underside. In May, its abundant flowering grouped in corymbs consists of beautiful large salmon orange flowers in bud, which open to pale pink tinged with cream while retaining a darker pink underside.
Like all yakushimanum hybrids, affectionately nicknamed "yak rhodos" by specialists, the Rhododendron 'Grumpy' is hardy down to -15°C (5°F) or even -20°C (-4°F). Although they prefer partial shade, these hybrids tolerate the sun as long as it is not scorching and their base remains moist, for example, covered by ground covers (heathers, Canadian Dogwood, etc.). Slow-growing, this acid-loving bush prefers moist, light, and well-drained soils with a tendency towards acidity or neutrality, as yak rhododendrons are also quite tolerant of soil types.
Unjustly named 'Grumpy', in reference to the seven dwarfs, it will easily adorn a small shaded area of the garden and brighten it up with its vibrant spring flowering without grumbling! Plant it alongside ferns, Pieris, heathers, Kalmias, Azaleas, Japanese Maples, or other rhododendrons from the same group to create spectacular spring flower kaleidoscopes.
Rhododendron yakushimanum Grumpy in pictures
Plant habit
Flowering
Foliage
Botanical data
Rhododendron
yakushimanum
Grumpy
Ericaceae
Yakushima Rhododendron, Yakushimanum Rhododendron
Cultivar or hybrid
Planting and care
Plant the Rhododendron yakushimanum 'Grumpy' in a semi-shaded position, protected from cold and drying winds, in a moist, humus-rich, and light soil, with a tendency towards acidity or neutrality. Like all plants of the heath family, it does not tolerate limestone soils or heavy soils saturated with water in winter. If the soil remains moist in summer, this rhododendron can also tolerate non-burning sun exposure.
Dig a hole with a volume three times larger than the pot. Soak the root ball in non-limestone water and plant the bush at the level of the collar, in a mixture composed of leaf compost, gravel or pumice, and loam. Water generously and keep the soil moist in summer. Azaleas and Rhododendrons have a shallow root system. Therefore, they are sensitive to long periods of drought. That's why it is advisable to have humus-enriched soil and to water abundantly during drought periods. Moreover, this root system is not very strong, which is why it is essential to lighten heavy soils with draining materials (gravel, pumice, clay pellets) during planting. Place a mulch of shredded pine bark at the base of the bush every spring to keep the soil cool while maintaining an acidic pH.
Maintenance consists of cutting off faded flowers in summer and removing dead branches. Azaleas and Rhododendrons can sometimes be attacked by weevils that eat the edges of leaves and rootlets, as well as the famous "rhododendron beetle" which does not often cause severe damage. Effective biological solutions are available today against weevils. Yellowing of the leaves (chlorosis) in Rhododendrons indicates poor assimilation of iron from the soil and causes premature death of the plant. While limestone is often the cause, poorly drained soil or a deeply planted root ball can also explain the phenomenon.
Planting period
Intended location
Care
Planting & care advice
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Hardiness is the lowest winter temperature a plant can endure without suffering serious damage or even dying. However, hardiness is affected by location (a sheltered area, such as a patio), protection (winter cover) and soil type (hardiness is improved by well-drained soil).
The flowering period indicated on our website applies to countries and regions located in USDA zone 8 (France, the United Kingdom, Ireland, the Netherlands, etc.)
It will vary according to where you live:- In zones 9 to 10 (Italy, Spain, Greece, etc.), flowering will occur about 2 to 4 weeks earlier.
- In zones 6 to 7 (Germany, Poland, Slovenia, and lower mountainous regions), flowering will be delayed by 2 to 3 weeks.
- In zone 5 (Central Europe, Scandinavia), blooming will be delayed by 3 to 5 weeks.
In temperate climates, pruning of spring-flowering shrubs (forsythia, spireas, etc.) should be done just after flowering.
Pruning of summer-flowering shrubs (Indian Lilac, Perovskia, etc.) can be done in winter or spring.
In cold regions as well as with frost-sensitive plants, avoid pruning too early when severe frosts may still occur.
The planting period indicated on our website applies to countries and regions located in USDA zone 8 (France, United Kingdom, Ireland, Netherlands).
It will vary according to where you live:
- In Mediterranean zones (Marseille, Madrid, Milan, etc.), autumn and winter are the best planting periods.
- In continental zones (Strasbourg, Munich, Vienna, etc.), delay planting by 2 to 3 weeks in spring and bring it forward by 2 to 4 weeks in autumn.
- In mountainous regions (the Alps, Pyrenees, Carpathians, etc.), it is best to plant in late spring (May-June) or late summer (August-September).
The harvesting period indicated on our website applies to countries and regions in USDA zone 8 (France, England, Ireland, the Netherlands).
In colder areas (Scandinavia, Poland, Austria...) fruit and vegetable harvests are likely to be delayed by 3-4 weeks.
In warmer areas (Italy, Spain, Greece, etc.), harvesting will probably take place earlier, depending on weather conditions.
The sowing periods indicated on our website apply to countries and regions within USDA Zone 8 (France, UK, Ireland, Netherlands).
In colder areas (Scandinavia, Poland, Austria...), delay any outdoor sowing by 3-4 weeks, or sow under glass.
In warmer climes (Italy, Spain, Greece, etc.), bring outdoor sowing forward by a few weeks.