Alnus x spaethii
Alnus x spaethii
Alnus x spaethii
Alnus x spaethii
Alnus x spaethii
Alnus x spaethii
Spaeth Alder
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Available in 1 sizes
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Available in 1 sizes
This plant carries a 24 months recovery warranty
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We guarantee the quality of our plants for a full growing cycle, and will replace at our expense any plant that fails to recover under normal climatic and planting conditions.
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Description
The Spaeth alder, also known as Alnus spaethii, is an ornamental hybrid tree much appreciated for the opulence and beauty of its very slender, dark green, shiny, large foliage which remains on the tree for a long time before it falls in winter. The species is of medium size and has a conical, pyramidal, regular habit, wider than the Corsican alder, making it an excellent shade tree. Being very hardy and resistant to pollution, it is found in latitudes as far up as northern Europe, either alone or in rows in urban landscapes. Easy to grow, it tolerates all not too dry soils, in full sun or partial shade.
The Alnus spaethii is a deciduous hybrid tree of the Betulaceae family resulting from breeding in Berlin in 1908 between Alnus subcordata and Alnus japonica. It is a vigorous tree that stands out from other alders by its very large leaves, 18 cm (7.1 in) long and 6 cm (2.4 in) wide, lanceolate in shape, dark green and shiny, with small spaced teeth and curved veins. For this reason it is often confused with other distinct species, particularly with the wild cherry, the persimmon, and the Cornus controversa. In autumn, it displays beautiful autumnal colours in yellow tones. Its dense foliage is carried by loose and upright branches that spread more with age. The tree eventually forms a wide, symmetrical pyramid with a maximum height of 15 metres and a width of 10 metres. It has very fast growth, reaching a rate of 50 cm (19.7 in) per year! The male catkins, yellow-brown in colour and 5.5 cm (2.2 in) long, open in late winter, as early as late January. The female flowers are insignificant. It is an exceptional tree in terms of ease of cultivation. Hardy down to -30°C (-22 °F), it has no specific requirements and can grow in slightly acidic or slightly alkaline soils, even poor ones, as long as they are not too dry.
The Spaeth alder is mainly used alone or in rows in urban public spaces. Thanks to its dense foliage, it is perfectly suited for planting alone to create a shaded corner in a large or medium-sized garden. With its elegant silhouette and reasonable size, this suits more structured gardens, whether old or contemporary. In more natural gardens, plant in a grove with other species of deciduous and evergreen trees with different habits.
Alnus x spaethii in pictures
Plant habit
Flowering
Foliage
Safety measures
Botanical data
Alnus
x spaethii
Betulaceae
Spaeth Alder
Cultivar or hybrid
atteinterespiratoire
Cette plante peut entraîner des symptômes allergiques.
Evitez de la planter si vous ou vos proches souffrez de rhinite saisonnière ("rhume des foins").
Davantage d'informations sur https://plantes-risque.info
Planting and care
Easy to grow, Spaeth's Alder requires little maintenance. It can be planted in not too dry to moist soil, in full sun or partial shade. It tolerates urban pollution well. Prune only to remove dead or unnecessary branches.
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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