Sorbus decora – American mountain ash

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Rosaceae

Sorbus decora – American mountain ash

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Occurs in the wild in North America where it grows to a height of 6 - 8 m and a width of approx. 4 - 5 m. The crown is compact and is formed by stiff ascending branches. The leaves are imparipinnate and have a dark red stem. The leaflets are 3 to 8 cm in size and elliptical to elongated in shape. They are bluish-green on the upper side: the underside is light green. Deep red fruits follow the flowers, hanging in remarkably large umbels of up to 20 cm in diameter. S. decora produces abundant fruit. Because it makes so few demands on the soil this tree can be used in many places, provided that the soil is well drained. It is very winter-hardy and is little sensitive to bacterial fire blight.

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Specifications
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Height
6 - 8 m
Crown
broad ovoid, half-open crown
Bark and branches
twigs olive-green to reddish-brown
Leaf
imparipinnate, 15 - 25 cm, with 11 - 17 leaflets, bluish-green, feathered leaf
Flowers
white, in umbels of approx. 15 cm Ø, May/June
Fruits
deep red fruits, Ø approx 1.5 - 2 cm, in very large umbels
Spines/thorns
None
Toxicity
usually not toxic to people, (large) pets and livestock
Soil type
makes few demands, can grow on poor soils
Soil moisture
suitable for dry soil, withstand short flood
Paving
tolerates no paving
Winter hardiness zone
3 (-40,0 to -24,5 °C)
Wind resistance
good
Other resistances
resistant to frost (WH 1 - 6), can withstand wind
Fauna tree
valuable for bees (honey plant), provides food for birds
Application
avenues and broad streets, narrow streets, small gardens
Shape
clearstem tree
Origin
North America
Clear stem tree acid soil loamy soil peaty soil tolerates no paving resistant to frost (WH 1 - 6) suitable for dry soil withstand short flood can withstand wind broad ovoid 2nd size, between 6 and 12 metres half-open crown bluegreen green white May early sprout average growing Conspicuous bloom Feathered leaf valuable for bees (honey plant) provides food for birds non-toxic (usually) Ornamental fruit
Frequently asked questions
Sorbus decora

Sorbus decora can eventually reach a height of 6 - 8 m, depending on the site and climate conditions.

Sorbus decora is average growing and can eventually reach a height of 6 - 8 m, depending on the site and climate conditions.

The right time to plant Sorbus decora is during the dormancy period. In Western Europe, Sorbus decora with root balls can generally be planted from mid-November to late April, although this depends strongly on the climatic conditions and the species of tree.

Sorbus decora blooms in may.
General