Alnus glutinosa Greenwood - Black alder
Alnus glutinosa Greenwood - Black alder
Alnus glutinosa Greenwood
Common alder, Black alder, European alder
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Available in 1 sizes
Available in 1 sizes
Available in 1 sizes
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
'Alnus glutinosa 'Greenwood', also known as Common Alder or Black Alder, is a variety that stands out for its twisted habit. Its branches are twisted, and sinuous, very similar to the undulating branches of the twisted willow. Its brown twigs are adorned from March onwards, before the foliage, with numerous yellowish-green to brown pendulous catkins that are highly decorative. Suitable for small gardens, this very elegant small tree also withstands diseases and pests very well. It excels in waterlogged and poor soils, where it is sometimes the only one able to grow.
In harsh climates and poor, marshy, and suffocating soils, the Common Alder, with its rot-resistant and lightweight wood, reigns supreme. This deciduous tree, belonging to the Betulaceae family, is widespread in the native flora of Europe, up to Scandinavia. It is sometimes called the alder or black alder. The 'Greenwood' variety was selected by J. Mauritz in Opheusden, Netherlands, in 2005. It is mainly distinguished by its twisted branches. It is a small tree with a pyramidal and airy habit, reaching a height of 5 to 6 m at maturity with an approximate spread of 3 m. Its growth is rather slow. Its foliage is light green and vibrant, even lighter underneath and slightly sticky to the touch, especially the young leaves. The buds are purple and also sticky, especially in winter. The spring inflorescence is a kind of small cone called a strobilus, 2 cm long, containing tiny winged fruits, dispersed by the wind. This tree retains its foliage for a long time.
As a pioneering species, loving water from any source, the Common Alder is used as a solitary tree, in groups, or to retain banks along streams, natural pools, or in waterlogged and acidic soils of damp undergrowth. It should be kept away from foundations and buildings, as its extremely developed root system (up to 4 m deep) is capable of obstructing drinking water pipes. Plant the 'Greenwood' Common Alder with shrubs or trees with similar requirements, such as Nyssa sylvatica or Bald Cypress. At its base, plant ferns like Onoclea sensibilis, in neutral to acidic and moist soil, in full sun or partial shade. An elegant small tree, ideal for riverside or marsh scenes, in light shade or full sun.
The Common Alder is also a useful tree, used in forests to prepare and improve the soil before planting poplars. Considered a green manure by foresters, it purifies and enriches the soil in which it is planted, as its roots convert atmospheric nitrogen into plant proteins. Its wood, almost rot-resistant in water, was once used for the construction of underground water pipes and channels. A large part of the city of Venice is said to have been built on piles made of Alder wood.
Alnus glutinosa Greenwood - Black alder in pictures
Plant habit
Flowering
Foliage
Safety measures
Botanical data
Alnus
glutinosa
Greenwood
Betulaceae
Common alder, Black alder, European 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 in consistently moist soil, the Greenwood Glutinous Alder requires little maintenance. Plant it in moist, humus-bearing soil, even peaty and poor, preferably acidic, in full sun or partial shade. It tolerates wind 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).
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.