Rhododendron INKARHO Marcel Ménard
Rhododendron INKARHO Marcel Ménard
Rhododendron INKARHO Marcel Ménard
Rhododendron INKARHO® Marcel Ménard
Rhododendron
The flowers are exceptional and the shrub seems happy where it is.
alexandra, 24/05/2026
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Description
Rhododendron Inkharo Marcel Ménard, just like the other varieties in the Inkharo range, is grafted onto an amazing Rhododendron that tolerates clayey and slightly chalky soils much better. This old French variety dating back to 1924 remains exceptional due to its dark purple colour and its large round inflorescences, each flower delicately marked with ochre and dotted with brown. The compact bush has a lovely rounded habit and is adorned with particularly dark green foliage, which is attractive all year round. It will flower in April-May, creating a dazzling display in partially shaded borders. Fully hardy, it tolerates sun fairly well as long as the soil remains consistently moist.
Rhododendrons encompass over 800 species in the heather family, grown for their massive and beautiful blooms. The history of the Inkharo Rhododendrons, plants that are a bit revolutionary and were recently presented at the Chelsea Flower Show, began in Germany over 20 years ago. The discovery of a rhododendron naturally growing in a chalk quarry led to the grafting of different varieties onto its extraordinary root system. The bushes obtained through this method tolerate a wide range of soils with a pH ranging from 4.5 to 7.5, provided they are loose, fertile, moist, and not excessively chalky. In summary, a soil that is suitable for hydrangeas.
The variety 'Marcel Ménard', obtained by hybridizers Croux et Fils in 1924, is one of the darkest cultivars, both in terms of flowers and foliage.
The bush is wider than it is tall, reaching approximately 1m (3ft) in height and 1.2m (4ft) in width at maturity. Under particularly favourable conditions, the bush can grow up to 1.5m (5ft) in height. The branches are abundantly covered with narrow evergreen foliage that is very dark and glossy. It is a slow-growing, but vigorous and hardy plant. In April-May, its spectacular flowering consists of corymbs of 15 beautiful large flowers! The buds, a dark purple, open into flowers of a warm violet reminiscent of petunias, beautifully adorned with orange-ochre areas called 'imperial' and dotted with brown at the base of the petals. The flower's throat also features beautiful white stamens.
It is high time for Rhododendrons to break free from the constraints of soil conditions: this is now possible with the new Inkharo varieties, which are no more difficult to cultivate than hydrangeas! The Rhododendron Inkharo Pierre Ménard will thrive in partial shade in a moist, fertile, loose soil without excess chalk. Reasonably hardy, it will reach its full potential in a humid and cool climate. It can be used as a stand-alone specimen or in mass plantings, especially with other acid-loving plants or simply with other flowering shrubs, the choice is vast! It can be paired with lilacs, with its violet flowers complementing their white, pink, purple, mauve, or violet clusters, stellata magnolias, and of course hydrangeas and camellias... It can also be planted in a beautiful pot on the terrace, taking care to regularly provide it with fertilizer and water (not too chalky) for watering.
Rhododendron INKARHO Marcel Ménard in pictures
Plant habit
Flowering
Foliage
Planting and care
Plant the Rhododendron Hinkaro Marcel Ménard in a shady or semi-shady location, protected from cold and drying winds, in a moist, loose, fertile soil. It should be slightly alkaline, neutral or acidic, just like soil that suits a hydrangea. Dig a hole three times larger than the pot. Soak the root ball in water and plant the bush at the level of the collar, in a nourishing mixture composed of leaf compost, gravel or pumice, and loam or topsoil, as Inkarho Rhododendrons are hungry plants. Water generously and keep the soil moist in summer.
Azaleas and Rhododendrons have a relatively shallow root system. As a result, they are sensitive to long periods of drought. That's why soil enriched with humus and abundant watering during dry periods is recommended. Apply a layer of wood chips or mulch around the base of the bush every spring to keep the soil cool while maintaining a slightly acidic pH.
Maintenance consists of removing faded flowers after flowering and pruning out any dead branches. Azaleas and Rhododendrons can sometimes be attacked by weevils that eat the edges of the leaves and rootlets, as well as by the infamous "rhododendron caterpillar," which does not usually cause significant damage. There are effective natural solutions against weevils. Yellowing of the leaves (chlorosis) in Rhododendrons indicates poor assimilation of iron from the soil and leads to the 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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