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Rhododendron Lems Monarch

Rhododendron Lem's Monarch
Rhododendron

4,8/5
13 reviews
2 reviews
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No flower to come, only leaf buds.

Isabelle M., 07/05/2019

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This plant carries a 24 months recovery warranty

More information

Value-for-money
Delicate yet impressive in size, this spectacular American hybrid is distinguished by its enormous flowers, grouped in inflorescences up to 30cm, its soft marginate pink colour, its long flowering period and its adaptability!
Flower size
12 cm
Height at maturity
1.75 m
Spread at maturity
2.25 m
Exposure
Sun, Partial shade
Hardiness
Hardy down to -18°C
Soil moisture
Moist soil
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Best planting time March to April
Recommended planting time February to May, September to October
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Flowering time May to June
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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

Rhododendron Lems Monarch (Foliage) Foliage

Plant habit

Height at maturity 1.75 m
Spread at maturity 2.25 m
Habit Irregular, bushy
Growth rate normal

Flowering

Flower colour pink
Flowering time May to June
Inflorescence Corymb
Flower size 12 cm
Bee-friendly Attracts pollinators

Foliage

Foliage persistence Evergreen
Foliage colour dark green

Botanical data

Genus

Rhododendron

Cultivar

Lem's Monarch

Family

Ericaceae

Other common names

Rhododendron

Origin

Cultivar or hybrid

Product reference804801

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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.

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Planting period

Best planting time March to April
Recommended planting time February to May, September to October

Intended location

Suitable for Woodland edge, Undergrowth
Type of use Border, Back of border, Free-standing
Hardiness Hardy down to -18°C (USDA zone 7a) Show map
Ease of cultivation Amateur
Planting density 1 per m2
Exposure Sun, Partial shade
Soil pH Acidic
Soil type Silty-loamy (rich and light)
Soil moisture Moist soil, rich and well-drained

Care

Pruning No pruning necessary
Soil moisture Moist soil
Disease resistance Very good
Overwinter Can be left in the ground
4,8/5
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