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Trees of Iowa: An Interactive Key

Showy Mountain Ash
(Sorbus decora)



Leaves are opposite-branching and pinnately compound leaves.


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Showy Mountain Ash also known as Northern Mountain Ash is a native of Iowa. It is a large shrub or small tree similar to the American Mountain Ash, but different because the leaflets are narrow, oblong-oval, only 2 to 3 times as long as broad, a pointed tip, and paler (whiter) beneath.

Hardiness: zones 3 through 9

Growth Rate:
moderate to fast

Mature Shape:
slightly pyramidal, upright with a rounded crown

Height:
50 to 80 feet

Width:
50 to 70 feet

Site Requirements:
Native to Iowa, ash trees grow best in full sun and moist, well-drained soils. Ash trees are tolerant of a wide range of soil conditions.

Flowering Dates: May - July

Seed Dispersal Dates: August - June

Seed Bearing Age:

Seed Bearing Frequency:

Seed Stratification: Prechill for 2 months at 34F to 40F

The flowers are larger than American Mountain Ash; 3/8 inch across, and the cluster is more diffuse. The fruits are also larger at 3/8 inch across.

Its range is from southern Greenland, Labrador, and Newfoundland westward to northern Ontario and Minnesota; and southward to Maine, New York, Ohio, northern Indiana, and extreme northeast Iowa. It can be found naturally occurring in woodlands and on rocky shores and slopes preferring well drained rich soil.

 

Click on a thumbnail image below to view larger pictures.
Showy Mountain Ash Fruit Showy Mountain Ash Fruit Showy Mountain Ash Flowers Showy Mountain Ash Form Showy Mountain Ash Fruit Showy Mountain Ash Leaves