Rhododendron Lord Roberts
Rhododendron Lord Roberts
Rhododendron Lord Roberts
Rhododendron Lord Roberts
Rhododendron Lord Roberts
Rhododendron Lord Roberts
Rhododendron Lord Roberts
Rhododendron Lord Roberts
Rhododendron
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Description
Rhododendron 'Lord Roberts' is an absolutely stunning old hybrid with dark red flowers. It is a hardy evergreen bush that can tolerate the sun and even heat in cool soil. With its large, shiny flowers of dark red, maculated with purple and adorned with white stamens, it is perfect for brightening up the garden in spring. Its dark green, glossy evergreen foliage is interesting even when not in bloom. This excellent variety has received the RHS Award of Garden Merit for its ornamental qualities and performance in the garden. With its dense, compact, and upright habit, it will be magnificent in an ericaceous bed or in a large container, in partial shade or even in full sun!
Rhododendrons belong to the Ericaceae family, just like heathers, preferring humid climates and soils devoid of limestone, tending towards acidity. 'Lord Roberts' naturally forms a dense, compact, and upright bush, reaching about 2 m (6.6 ft) in height and 1.5 m (4.9 ft) in width. Its growth is rather slow. Its evergreen leaves, with a slightly satin finish, are elliptical in shape and cover the plant well. They have a very fuzzy underside. In May, its remarkably abundant flowering overwhelms the bush: beautiful large bell-shaped flowers open in loose corymbs. Their very intense dark red colour, maculated with dark purple, is enhanced by the shiny texture of the petals and the white tips of the stamens, like small jewels clustered at the heart of the flower.
Rhododendron 'Lord Roberts' is a glossy bush, hardy down to -15° C (5° F) or even -20° C (-4° F) and easy to grow as long as the conditions suit it, in terms of soil and climate. Even though they prefer partial shade, hybrid Rhododendrons with large flowers can tolerate the sun as long as it is not scorching and their base remains cool. 'Lord Roberts', with its generous and sparkling flowering, will elegantly dress up a small partially shaded area of the garden, terrace, or balcony. Plant it alongside ferns, blue or variegated hostas, Pieris, heathers, Kalmias, Azaleas, and Japanese Maples, or other rhododendrons from the same group to create stunning patchworks of textures and colours in spring. Cultivating it in a container requires regular watering with non-limestone water and specific fertiliser for ericaceous plants.
Rhododendron Lord Roberts in pictures
Plant habit
Flowering
Foliage
Botanical data
Rhododendron
Lord Roberts
Ericaceae
Rhododendron
Cultivar or hybrid
Planting and care
Plant in a partially shaded position, protected from cold and drying winds, in moist, humus-rich and light soil, with a tendency towards acidity or neutrality. Like all plants of the ericaceous family, it does not tolerate calcareous soils or heavy soils saturated with water in winter. If the soil remains moist in summer, this rhododendron can also tolerate exposure to non-burning sunlight. Avoid planting around its base, as its shallow roots do not tolerate competition from other plants, especially for water resources.
Dig a hole three times larger than the pot volume. Soak the root ball in non-calcareous water and plant the bush at the level of the collar, in a mixture composed of 1/4 turf, leaf compost, gravel or pumice stone, and loam. Water thoroughly and keep the soil moist in summer. Azaleas and Rhododendrons have a shallow root system. As a result, they are susceptible to long periods of drought. That's why a humus-enriched soil and abundant watering during dry periods are recommended. Furthermore, this root system is not very strong, which is why it is essential to lighten heavy soils with draining materials (gravel, pumice stone, clay pellets) when planting. Apply a mulch of shredded pine bark at the base of the bush every spring to retain soil moisture while maintaining an acidic pH.
Maintenance consists of removing faded flowers in summer and removing dead branches. Azaleas and Rhododendrons can sometimes be attacked by vine weevils that eat the edges of leaves and rootlets, as well as the infamous "rhododendron beetle" which does not often cause severe damage. Yellowing of the leaves (chlorosis) in rhododendrons indicates poor assimilation of iron in the soil and can lead to premature plant death. While limestone is often the cause, poorly drained soil or deeply planted root balls 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.