Hydrangea macrophylla Soeur Thérèse
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Caroline P.
Hydrangea macrophylla Soeur Thérèse
Caroline P. • 91 FR
Hydrangea macrophylla Soeur Thérèse
Hydrangea macrophylla Soeur Thérèse (Petite Sœur Thérèse de l'Enfant Jésus)
Bigleaf Hydrangea, French Hydrangea
Very nice spring revival with the first flowers appearing. A sturdy plant with healthy foliage.
Golestan, 12/04/2025
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Description
The 'Sœur Thérèse' Hydrangea macrophylla is a unique and delicate variety of hydrangea that dates back to 1944. It has excellent floribundity and produces rounded, light flower heads with cool, white-coloured florets with a small blue heart. The flowers gradually turn red in late summer before taking on a mysterious watery green hue in autumn, adding a mystical charm to the place. The plant has magnificent dark green and bluish foliage that adorns a slightly spread-out tall bush supported by graceful but robust stems. It thrives best in shaded, cool exposure and non-chalky soil to reveal its true beauty.
The Hydrangea macrophylla Soeur Thérèse, also known as "Petite soeur Thérèse de l'enfant Jésus," was created in Paris. Often confused with the famous 'Mme E. Mouillère' variety by Victor Lemoine, Soeur Thérèse's flower is whiter, its foliage less serrated, and its stems thicker and more sturdy. Soeur Thérèse results from cross-breeding between the H. macrophylla and H. aspera species. All of these hardy plants belong to the Hydrangea family, which is native to China and Japan.
Soeur Thérèse has a rather spread out and full habit, regular and slightly arched. When mature, it reaches around 1.50 m (4 ft 11 in) in height with a spread of 1.70 m (5 ft 7 in). From July to September, its small fertile and sterile flowers, with striking dimorphism, form round flower heads measuring 16 to 18 cm (7.1 in) in diameter that are loose, with visible petioles. They form pure white sterile florets when they bloom, the colour of which evolves if the plant is sufficiently shaded. The flowering extends over foliage that looks very healthy, with a dark bluish-green colour, rather matte.
The leaves are opposite, reaching a minimum length of about twenty centimetres. They are simple, ovate to elliptical, ending in a tapered point and coarsely serrated like a saw. Hydrangeas can live for at least 50 years.
The Soeur Thérèse Hydrangea is a beautiful and intriguing plant with a delicate appearance and perfect for growing in semi-shade. Hydrangeas are well known for their ability to brighten up the north side of houses, and this particular variety will thrive in areas with an east or north-facing exposure where it can avoid the scorching summer sun. These plants can be used in shrub beds and hedges, and they add a lot of charm to areas of the garden that are a bit darker or near a concealed entrance.
Although Soeur Thérèse Hydrangeas do not like limestone, they are not strictly acid-loving plants. You can pair them with Magellan fuchsias, annual impatiens, or plant spring-flowering bulbs in front of their rounded silhouette. You can enjoy their sumptuous and long-lasting flowering in the garden or bring them inside the house.
Hydrangea macrophylla Soeur Thérèse in pictures
Plant habit
Flowering
Foliage
Planting and care
It's best to plant the Sœur Thérèse macrophylla hydrangea in spring or early autumn. You should choose a semi-shaded spot against an east- or north-facing wall. It's essential to protect the plant from cold and drying winds.
The plant needs a few hours of sunlight each day to get beautiful autumn colours. The plant doesn't necessarily need ericaceous soil but prefers deep, moisture-retaining, well-drained, and fertile soil. Before planting, enrich the soil with a good fertiliser.
If the soil is dry at the base of the wall, it's best to place the root ball at least 30 or 40 cm (11.8 - 15.7 in) away from the base. This will help retain moisture in the soil better.
The Hydrangea macrophylla is very hardy and can be planted in cold regions without too much concern. To prune your plant, remove the faded flowers on the uppermost bud or the pair of buds directly below it. Next, cut back to the base by a quarter or one-third of the oldest stems. This will encourage the formation of young shoots. It's best to perform this pruning annually between March and April.
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.
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