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Sorbus americana (photo courtesy of David Cavagnaro)
Sorbus americana (photo courtesy of David Cavagnaro)

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Zones 1-6
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Full, Partial
Regular Water
Moderate

Sorbus americana

Mountain Ash
Rosaceae
Deciduous, Shrubs, Trees, Decorative fruit or berries

SORBUS

These natives of mountainous areas are valued for their showy flowers and showier fruit. Blossoms are grouped in broad, flat clusters that are scattered over the foliage canopy in spring; they develop into hanging clusters of small, berrylike fruit that colors up in late summer or early fall. Most species have red or orange-red fruit, but white, pink, and golden forms are occasionally available. Birds feed on the fruit, but usually not until after the leaves have fallen. Foliage is typically finely cut and somewhat fernlike, though some less widely planted species have undivided leaves. Some mountain ashes have good fall color. Plants need good, well-drained soil and some winter chill. Cankers are a problem for trees under stress. Watch for fireblight. Good small garden or street trees, though the fruit can make a mess on paved surfaces.

Sorbus americana

Tree or shrub, from eastern North America. Grows to 10–30 ft. tall and wide. Dark green leaves with paler undersides reach 10 in. long and consist of 11 to 17 leaflets; turn yellow in fall. Orange-red fruit. This species is very hardy and tolerates damp soil, but it is not the choicest of mountain ashes. ‘Red Cascade’ is an attractive variety with an oval crown and compact growth to 16 ft. tall and 8 ft. wide.

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