Western Mountain Ash vs Lewis Mock Orange - TreeTime.ca

Western Mountain Ash vs Lewis Mock Orange

Philadelphus lewisii

Sorbus scopulina

COMING SOON

(new stock expected: fall of 2026)

NOT AVAILABLE THIS SEASON - MIGHT RETURN

Lewis Mock Orange
Western Mountain Ash

Lewis Mock Orange is a flowering ornamental shrub that produces an abundance of white, fragrant blooms. The flowers have a sweet scent similar to orange blossoms, with a hint of pineapple. They bloom for several weeks from late spring to early summer, attracting pollinators and other beneficial insects.

Native to North America, Lewis Mock Orange is found from the southernmost portions of Alberta and British Columbia, and south into the northwestern United States. It makes an attractive shrub and can be used in hedgerows, pollinator gardens, and naturalization projects. Blooms occur on the previous year’s wood, so it is recommended to prune after it has finished flowering.

Western Mountain Ash is a popular ornamental tree native to the western part of North America. Its attractive, white clusters of flowers bloom in early summer, making way for red, yellow or orange fruit in the fall. If the fruit doesn't catch your eye, Western Mountain Ash's autumn colours will capture your–and the birds's–attention.

Lewis Mock Orange Quick Facts

Western Mountain Ash Quick Facts

Zone: 4a
Zone: 2a
Height: 3 m (10 ft)
Height: 9 m (30 ft)
Spread: 2.4 m (8 ft)
Spread: 6 m (20 ft)
Light: partial shade, full sun
Light: full sun
Moisture: dry, normal
Moisture: dry, normal
Growth rate: medium
Growth rate: medium
Life span: medium
Life span: medium
Growth form: upright to arching, multi-stemmed
Spreading: suckering - medium, seeds - low
Suckering: none


Flowers: fragrant, white
Flowers: white
Bloom time: mid spring to early summer
Berries: bunches of orange-red berries appear in late summer
Hybrid: no
Hybrid: no
Catkins: no
Catkins: no


Native to: AB, BC
Native to: AB, BC, SK, MB, YT, NT
Other Names: california mock orange, lewis mockorange, western mock orange, western syringa, wild mock orange
Other Names: cascade mountain ash, greene mountain ash