Rhododendron Lems Monarch
Rhododendron Lems Monarch
Rhododendron Lem's Monarch
Rhododendron
Vigorous young plant transplanted in partial shade under large maple trees, which has taken well. No flowers the first year, but this rhododendron has developed nicely in anticipation of flowering next spring, I hope.
Martine , 04/08/2025
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Description
Delicate yet impressive in size, the Rhododendron 'Lem's Monarch' is a spectacular American hybrid that stands out for its huge flowers, grouped in inflorescences up to 30cm, its soft marginate pink colour, its long flowering period, and its adaptability!
Created by an enthusiast from the Seattle region in the 60s, the Rhododendron 'Lem's Monarch' is a truly exceptional bush. Each of its flowers measures from 10 to 12cm (4 to 5in) wide, and these corollas are grouped in conical inflorescences measuring 30cm (12in) in height! Initially carmine red in buds, the petals are a light pink marginated with bright pink on the inside. Their delicate texture resembles satin or porcelain. Flowering occurs in May, at the latest early June. Supposed to be triploid, fertilization of the rhododendron 'Lem's Monarch' is difficult: its flowers thus fade less quickly, giving it exceptional flowering both in terms of duration and dimensions.
Despite its titanic flowers, this bush remains of reasonable proportions: it will form a large bush 1.75m (6ft) tall with a width of about 2.5m (8ft) after 10 years. The evergreen foliage is abundant and sturdy, a superb dark green with a lighter central vein. It remains on the plant for two years. Each leaf measures 14 to 20cm (6 to 8in) long. Hardy down to -15°C (5°F) to -20°C, this Rhododendron tolerates sun and wind quite well and has a powerful root system that allows it to adapt to more challenging conditions than most other rhododendrons. However, it remains a plant that prefers acidic, light, airy, moist, and humus-rich soil in partial shade.
The Rhododendron 'Lem's Monarch' will be ideal in a bed or as a standalone plant. It will decorate your garden all year round and animate it in spring with its numerous bicoloured flowers in light and dark pink. Plant it alongside other acid-loving plants such as Magnolias, Pieris, Heather, Kalmias, Azaleas, and Japanese Maples.
Rhododendron Lems Monarch in pictures
Plant habit
Flowering
Foliage
Planting and care
Plant the Rhododendron 'Lem's Monarch' in a sunny, semi-shaded or shaded position, protected from cold and drying winds, in a moist, humus-rich and light soil with an acidic tendency. Like all heathland plants, it does not tolerate limestone soils or heavy soils that become waterlogged in winter. Dig a hole three times larger than the pot volume. 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 thoroughly and keep the soil moist in the summer. Azaleas and Rhododendrons have a shallow root system. As a result, they are sensitive to long periods of drought. That is why humus-rich soil and abundant watering during dry periods are recommended. In addition, this root system is not very strong, which is why it is essential to lighten heavy soils with draining materials (gravel, pumice, clay pellets) at planting. Apply 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 clearing the plant of dead branches. Azaleas and Rhododendrons can sometimes be attacked by weevils that eat the edges of leaves and rootlets, as well as by the famous "rhododendron beetle" which does not often cause severe damage. There are very effective natural solutions against weevils. Yellowing of leaves (chlorosis) in Rhododendrons indicates poor assimilation of iron from the soil and leads to 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).
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 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.
The planting period indicated on our website applies to regions in USDA Zone 9a (East Coast and Midlands: Dublin, Wexford, Waterford, Kilkenny, Portlaoise). It will vary depending on where you live:
- On the west coast and in the north-west (Galway, Limerick, Sligo, Donegal, Westport), delay planting by 1 to 2 weeks in spring and bring it forward by 1 to 2 weeks in autumn compared to the dates given, preferably choosing periods without strong winds.
- In the inland hills and plateaus (Wicklow Mountains, Macgillycuddy’s Reeks, Connemara, Killarney), it is best to plant in spring (April–May) or autumn (September–October), avoiding periods of waterlogged soil in winter and strong winds, which pose the main risk to newly planted trees in these areas.
The flowering period indicated on our website applies to regions in USDA Zone 9a, such as the East Coast and Midlands, including Dublin, Wexford, Waterford, Kilkenny and Portlaoise.
This will vary depending on where you live:
- On the west coast and in the northwest (Galway, Limerick, Sligo, Donegal and Westport), it will be delayed by one to two weeks compared to the given dates, due to stronger Atlantic winds and less spring sunshine.
- In the inland hills and plateaus (the Wicklow Mountains, the Macgillycuddy's Reeks, Connemara and Killarney), flowering will be delayed by two to three weeks. Flowering mainly occurs between May and July, with the limiting factors being less frost and more of the excessive humidity, strong winds and lack of sunshine that are characteristic of these areas.
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