Ontario's Tree Atlas: American Mountain-Ash (Sorbus americana)

Leaf; Photo: MNR

Bark; Photo: Steven J. Baskauf,
Bioimages
Fruit; Photo: Bruce Marlin
(Creative Commons License)
Tree; Photo: Robert G. Underwood

Did you know?
Birds eat the fruit from the mountain-ash and they spread seeds, helping new trees to grow.

The American mountain-ash is a small tree, up to 10 metres tall.  It grows across Ontario, south of Hudson Bay.  Its leaves have 13 to 17 leaflets which are 5 to 10 centimetres long, with toothed edges.

 

In May and June, the tree is covered in clusters of white flowers. Later in the summer, bunches of bright orange-red berries appear, 4 to 6 millimetres in diameter. 

 

The American mountain-ash prefers moist ground but can also grow in rocky and dry soil, but it will be more stunted on rocky sites.

 

Size:  10 metres tall
Moisture:  Prefers moist ground, but can survive in dry conditions
Shade:  Can tolerate some shade
Soil: Grows in a variety of soils

 

Planting tip:  Pretty flowers and leaves and bright colourful berries make the American mountain-ash a popular choice for landscaping. More tips...

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