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Rosa Societe Nationale d'Horticulture de France 'Delflouge' - Bush Rose

Rosa 'Delflouge' SOCIETE NATIONALE D'HORTICULTURE DE FRANCE
Bush Rose

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This compact rose bush carries cut flower arrangements of large, bright red, very double flowers from May until the frosts. Its dark green, disease-resistant foliage forms a beautiful setting for its regular and generous flowering. It is a good variety for flower beds and small flowering hedges.
Flower size
9 cm
Height at maturity
90 cm
Spread at maturity
50 cm
Exposure
Sun
Hardiness
Hardy down to -20.5°C
Soil moisture
Moist soil
Best planting time March, October to November
Recommended planting time January to April, September to December
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Flowering time May to October
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Description

The rose Société Nationale d’Horticulture de France® is a Delbard creation that pays tribute to the Société Nationale d’Horticulture de France. It is a floribunda characterised by its clusters of large, intense red flowers, very repeat flowering, compact habit and good disease resistance. In flower beds, large borders and small gardens, this bush is decorative from spring to autumn.

This cultivar belongs to the Rosaceae family. It is a modern hybrid rose classified in the Floribunda horticultural group, with clustered flowers. It was bred in France by the Georges Delbard Nurseries and Rose Gardens, selected at Malicorne in the Allier, then christened in Paris on 22 May 2025 at the headquarters of the Société Nationale d’Horticulture de France. It is a thorny and deciduous shrub, like most garden roses.
The plant forms a small, dense, vigorous and well-branched bush, reaching 80 to 100 cm in height with a spread of about 50 cm at maturity. Its growth is regular, it fairly quickly forms a well-balanced specimen. The foliage, deciduous, is dark green, rather glossy, and retains a good appearance throughout the season thanks to good resistance to powdery mildew and downy mildew. The flowers open in clusters from May to October, until the first frosts. They measure around 9 cm in diameter, have 60 to 80 petals and display an intense, bright red colour that remains stable. Their fragrance is light but pleasant, with fresh notes of citrus, a heart of old rose and a subtly woody base. The main asset of this rose is its regularity: while many roses produce only one large flush of flowers, then sporadic reblooms, this one renews its clusters over many months.
This variety was created to pay tribute to the SNHF, an institution founded in 1827, with which the Delbard family has long been associated.

In the garden, this rose can be placed in a sunny border, a wide bed, in a small group of three specimens or in a low hedge. To accompany it, you can choose plants with a softer, more upright habit or other roses of a similar size. The Nepeta nervosa ‘Neptune’ forms a large blue mound that is very floriferous, the Stachys monieri ‘Hummelo’ offers tall, violet-pink spikes, the shrubby sage Salvia jamensis ‘Flammenn’ is a perfect match with its bright red flowers, the Agastache ‘Black Adder’ will take over in late summer. To edge a path, mix this bush with the rose Carte Blanche®, pure white, and the variety 'Berleburg', a deep pink.

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Roses: the best varieties and how to grow them
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by Alexandra 15 min.
Roses: the best varieties and how to grow them
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Rosa Societe Nationale d'Horticulture de France 'Delflouge' - Bush Rose in pictures

Rosa Societe Nationale d'Horticulture de France 'Delflouge' - Bush Rose (Flowering) Flowering
Rosa Societe Nationale d'Horticulture de France 'Delflouge' - Bush Rose (Foliage) Foliage

Plant habit

Height at maturity 90 cm
Spread at maturity 50 cm
Habit irregular, bushy
Growth rate fast

Flowering

Flower colour red
Flowering time May to October
Inflorescence Corymb, Double
Flower size 9 cm
Fragrance slightly scented fresh notes of citrus trees, heart of old rose, discreetly woody base
Good for cut flowers Cut flower blooms
Repeat-flowering Blooms several times a year

Foliage

Foliage persistence Deciduous
Foliage colour dark green

Botanical data

Genus

Rosa

Cultivar

'Delflouge' SOCIETE NATIONALE D'HORTICULTURE DE FRANCE

Family

Rosaceae

Other common names

Bush Rose

Botanical synonyms

Rosa 'Delflouge', Rosa Société Nationale d’Horticulture de France®

Origin

Cultivar or hybrid

Product reference259510

Planting and care

Plant your Société Nationale d'Horticulture rose bush in a sunny position (or in light afternoon shade). Modern roses are tolerant, but they do not appreciate shallow, poor and/or very dry soil in summer. They will adapt to any garden provided the soil is well-worked, deep, not too compact, rich, and always slightly moist. To install your rose bush, work the soil by breaking it up well and place an amendment such as dried blood or dehydrated horn meal at the bottom of the planting hole. Water generously after planting to eliminate air pockets. Water regularly for a few weeks to encourage rooting.

Roses are often spotted or look unsightly at the end of summer, but this is not a problem for their development. These spots are not dangerous for the rose; they are a natural phenomenon. Follow all our advice to remedy this and read our article: Help! I have spots on my roses

Planting period

Best planting time March, October to November
Recommended planting time January to April, September to December

Intended location

Suitable for Meadow
Type of use Border, Cut flowers, Small gardens, Container, Hedge
Preferred climate All
Hardiness Hardy down to -20.5°C (USDA zone 6b) Show map
Ease of cultivation Amateur
Planting density 1 per m2
Planting spacing Every 50 cm
Exposure Sun
Soil pH Any
Soil type Clayey (heavy), Clayey-chalky (heavy and alkaline), Silty-loamy (rich and light)
Soil moisture Moist soil well-shaped, and light

Care

Pruning instructions Pruning of modern repeat flowering roses is essential for flowering. It is carried out in three stages: 1. Maintenance pruning: regularly shorten the shoots that have flowered during the season. To encourage repeat flowering of repeat flowering roses, remove faded flowers together with their stem and 2 or 3 leaves. 2. Preparatory pruning in autumn: light, it anticipates the true spring pruning. In regions with cold winters, it is not recommended to avoid weakening the shrub. 3. Spring pruning: in February-March, when buds have become shoots 2 to 3 cm long: prune strong young branches to a quarter of their length. Pruning always aims to clear the centre of the shrub and remove dead wood, diseased branches and weak shoots. Keep the most vigorous, generally 3 to 6 well-positioned branches to maintain a good habit. Always prune at an angle, ½ cm to 1 cm above an outward-facing bud.
Pruning Pruning recommended once a year
Pruning time February to March, October to November
Soil moisture Moist soil
Disease resistance Good
Overwinter Can be left in the ground

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