Rhododendron Sainte-Marine
Rhododendron Sainte-Marine
Rhododendron Sainte-Marine
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Description
The Rhododendron ‘Sainte-Marine’ is a hybrid distinguished by its spring flowering in shades of pink to coral pink, heavily speckled. Its compact habit is well-suited to small gardens and decorating terraces. In a bed of heather soil, at the edge of woodland, or near a path, in partial shade, this variety offers a warm and refined flowering.
Belonging to the Ericaceae family, ‘Sainte-Marine’ is a cultivar obtained at the Domaine de Boutiguéry, in Gouesnac’h, renowned for its collections and its work in rhododendron hybridization. Its name celebrates the port of Sainte-Marine, located at the mouth of the Odet river, not far from the estate. The bush has a dense, rounded to slightly spreading habit, and its growth is rather slow. In open ground, it reaches approximately 1.20 m in height with a 1 m spread in 10 years; in a container, its dimensions remain more modest.
The flowering occurs in spring, from April to May, under a temperate oceanic climate. The inflorescences are broad and rounded. Each flower shows a funnel-shaped corolla with 5 lobes with slightly undulate and crumpled edges. Their colour ranges from pink to coral pink and pale apricot. The throat is distinctly punctate with brick red on the dorsal lobe. The centre is furnished with 10 slender stamens, with dark brown anthers and cream filaments surrounding a clearly visible light green style. The foliage, evergreen in winter, is composed of large, leathery, elliptical to obovate leaves, of a medium to dark green, glossy on the upper side. The root system is shallow, fibrous, and very ramified: it requires an acid soil (pH 4.5–6), rich in humus, consistently moist but without excess water, and dislikes lime.
Plant the Rhododendron ‘Sainte-Marine’ in partial shade, sheltered from drying winds, in a large pocket of acid soil well amended with leaf mould. In a border, combine it with acidophilous bushes of similar size to stagger the flowering periods: Pieris japonica ‘Katsura’ for spring, Camellia ‘Nuccio’s Pearl’ for winter, and Rhododendron ‘Madame Masson’ or ‘Percy Wiseman’. In a pot, choose a wide and deep container, a well-drained heather soil substrate, and water regularly with non-calcareous water, favouring light shade during the hottest hours.
The Domaine de Boutiguéry opens to the public each spring, with its grand avenues lined with rhododendrons and azaleas; ‘Sainte-Marine’ originates from patient selection work conducted on the slopes overlooking the Odet.
Rhododendron Sainte-Marine in pictures
Plant habit
Flowering
Foliage
Botanical data
Rhododendron
Sainte-Marine
Ericaceae
Cultivar or hybrid
Planting and care
Plant the Rhododendron 'Sainte-Marine' in a partially shaded position, sheltered from cold, drying winds, in a cool, humus-bearing, light soil, tending towards acidic or neutral. Like all ericaceous plants, it does not tolerate chalky soils, nor heavy soils that are waterlogged in winter. If the soil remains cool in summer, this rhododendron will also tolerate a position in non-scorching sun. Avoid planting at its base, as its shallow roots do not cope well with competition from other plants, particularly for water resources.
Dig a hole with a volume three times larger than the pot. Soak the root ball in water (non-chalky) and plant the bush at collar level, in a mixture composed of 1/4 turf, leaf mould, gravel or pozzolana and topsoil. Water copiously and keep the soil cool in summer. Azaleas and Rhododendrons have a relatively shallow root system. Consequently, they fear long periods of drought. This is why a soil enriched with humus 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, pozzolana, clay pebbles) at planting time. Apply a mulch of crushed 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 the faded flowers in summer and clearing away its dead branches. Azaleas and Rhododendrons can sometimes be attacked by vine weevils which eat the edges of the leaves and the rootlets, as well as by the famous 'rhododendron leafhopper' which does not often cause severe damage. Effective organic solutions exist today against vine weevils. Yellowing of the leaves (chlorosis) in Rhododendron indicates poor assimilation of iron in the soil and causes premature death of the plant. If chalk is frequently the cause, poorly drained soil or a root ball planted too deeply can also explain the phenomenon.
"Rhodos" come into their own in our Breton and Norman climates, planted in soil free of chalk, and in a humid atmosphere. Their cultivation in our warmer and drier climates is generally doomed to failure in the long run, despite all efforts made to acclimatise them.
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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