Hydrangea seemannii - Hortensia grimpant de Seemann
Hydrangea seemannii - Hortensia grimpant de Seemann
Hydrangea seemannii - Hortensia grimpant de Seemann
Hydrangea seemannii - Hortensia grimpant de Seemann
Hydrangea seemannii - Hortensia grimpant de Seemann
Hydrangea seemannii - Hortensia grimpant de Seemann
Hydrangea seemannii
Seemann's hydrangea
I bought one from you several years ago. It grew but never produced a single flower! Disappointing.
s, 26/11/2025
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Description
Hydrangea seemannii, l’hortensia grimpant de Seemann, est une liane persistante rare dans les jardins, remarquable par son feuillage vert foncé, coriace et luisant, qui reste décoratif en hiver. Ses tiges s’agrippent seules aux supports grâce à des racines aériennes et peuvent couvrir un grand mur ou monter dans un arbre. En été, de gros boutons arrondis s’ouvrent en ombelles légères blanches à blanc crème. Cette espèce originale séduira les collectionneurs et les jardiniers curieux, à la recherche d’une grimpante peu commune pour un jardin abrité.
Cet hortensia appartient à la famille des Hydrangéacées. C’est une liane persistante : ses tiges se lignifient au fil des années et son feuillage reste en place en hiver sous son climat de prédilection. L’espèce est originaire de la Sierra Madre occidentale, au Mexique, du Chihuahua et du Sonora jusqu’au Durango, au Sinaloa et au Nayarit. Elle pousse dans des forêts tempérées, souvent à proximité de cours d’eau, entre 1 050 et 2 750 m d’altitude. Dans son milieu naturel, elle grimpe comme le lierre sur les troncs et les rochers grâce à de nombreuses racines aériennes munies de crampons. Le botaniste Berthold Seemann en avait récolté des spécimens au Mexique au milieu du XIXᵉ siècle ; le nom Hydrangea seemannii, publié en 1924 par L. A. M. Riley, lui rend hommage. Au jardin, cette plante démarre assez lentement, puis devient vigoureuse lorsqu’elle est bien établie. Sur un support adapté, elle atteint 8 à 10 m de hauteur pour 3 à 4 m d’envergure, et peut dépasser ces dimensions avec l’âge dans un climat favorable. Arrivée au sommet d’un support, elle peut émettre des rameaux libres, plus arbustifs, et coloniser l’autre face d’un mur. Les feuilles opposées, ovales à lancéolées, mesurent 4 à 13 cm de long. Épaisses, entières et vert foncé, elles présentent une surface légèrement gaufrée et luisante. La floraison a lieu entre juin et août. Elle est constituée d'inflorescences de 12 à 20 cm de diamètre, composées de petites fleurs fertiles verdâtres à blanches entourées de fleurs périphériques plus grandes. Avant leur ouverture, elles sont enfermées dans de grosses bractées coriaces qui forment des boutons arrondis très reconnaissables. L'Hydrangea seemannii demande un climat doux et un emplacement protégé des vents froids. Sa rusticité se situe autour de -10 °C en situation abritée. Les jeunes sujets et le feuillage sont plus vulnérables face aux hivers froids et humides.
Cet hortensia grimpant de Seeman se plaira sous un climat tempéré, doux en hiver, pas trop sec en été. Il est intéressant pour couvrir un mur abrité, une façade peu ensoleillée ou le tronc d'un vieil arbre. Son feuillage reste décoratif toute l'année, et ses fleurs blanches sont lumineuses à mi-ombre. On peut l'accueillir dans une cour protégée, un jardin de ville ou un décor d’inspiration exotique. Pour l'entourer, choisissez des plantes d'ombre comme le Fatsia japonica, l’Aucuba japonica ‘Rozannie’, le Sarcococca confusa ou le Mahonia eurybracteata ‘Soft Caress’.
Hydrangea seemannii - Hortensia grimpant de Seemann in pictures
Plant habit
Flowering
Foliage
Botanical data
Hydrangea
seemannii
Hydrangeaceae
Seemann's hydrangea
North America
Planting and care
Hydrangea seemannii is preferably planted in spring in regions where winters can be a little cold, or in autumn in milder climates. Choose a position sheltered from cold winds, against a solid wall or at the foot of a large tree, in partial shade or in soft light. A little sun encourages flowering, but the soil must remain cool. Plant it in a deep, fertile, humus-bearing and well-drained soil; it can be acid, neutral or slightly chalky, but must be neither waterlogged nor too dry in summer. Water regularly for the first few years, especially at the foot of a wall where rain penetrates poorly, then mulch with compost or decomposed leaves. Guide and tie in the young stems until the aerial roots take hold.
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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