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Sorbus ‘Joseph Rock’ (Mountain Ash)

Mountain Ash 'Joseph Rock'

Sorbus 'Joseph Rock', Mountain Ash 'Joseph Rock', Small Tree, Yellow fruit, Yellow berries, Winter fruits, Fall Foliage
Sorbus 'Joseph Rock', Mountain Ash 'Joseph Rock', Small Tree, Yellow fruit, Yellow berries, Winter fruits, Fall Foliage
Eupatorium maculatum (Atropurpureum Group) 'Riesenschirm', Joe-Pye Weed 'Riesenschirm', Eupatorium maculatum 'Riesenschirm', Eupatorium purpureum subsp. maculatum 'Riesenschirm', Eupatorium 'Riesenschirm', Eupatorium purpureum subsp. maculatum 'Rise and Shine', Purple Flowers, Pink Flowers, Fall Flowers

An ideal specimen tree for small gardens, Sorbus ‘Joseph Rock’ (Mountain Ash) is a pretty, upright, deciduous tree with a long season of interest. In late spring it produces charming clusters of white flowers, 4 in. (10 cm), which are quickly followed by abundant clusters of vibrant, butter-yellow fruits. The elegant foliage of blue-green, pinnate leaves is divided into up to 21 leaflets and casts light shade in the summer months. It turns glowing shades of orange, purple, and red in the fall, before falling to the ground, revealing the pale plum-hued bark and striking silhouette of the plant. Highly ornamental, elegant in flower, and colorful in fruit, Sorbus ‘Joseph Rock’ stars in almost every season of the year.

  • Grows upright at first and broadens with age. Can reach 15-30 ft. in height (4-9 m) and 6-20 ft. in spread (2-6 m).
  • This tree is easily grown in full sun or light shade in moderately fertile, humus-rich soil, well-drained soils. Once established, it only needs occasional watering during dry weather. Tolerant of atmospheric pollution.
  • Perfect as a specimen plant, in city gardens or cottage gardens. Perfect for small gardens!
  • No routine pruning is necessary. Remove diseased, damaged, congested or crossing shoots.
  • Propagate by softwood cuttings in early summer, chip budding in summer or grafting in winter.

Requirements

Hardiness 7 - 8
Heat Zones 7 - 8
Climate Zones 2A, 2B, 3A, 3B, 4, 5, 6, 7, 8, 9, 10, 14, 15, 16, 17
Plant Type Trees
Plant Family Rosaceae
Genus Sorbus
Common names Ash, Mountain Ash
Exposure Full Sun
Season of Interest Spring (Late)
Summer (Early, Mid, Late)
Fall
Height 15' - 30'
(4.6m - 9.1m)
Spread 6' - 20'
(180cm - 6.1m)
Spacing 240" (6.1m)
Maintenance Low
Water Needs Average
Soil Type Clay, Loam, Sand
Soil pH Acid, Neutral
Soil Drainage Moist but Well-Drained, Well-Drained
Characteristics Showy
Garden Uses Beds And Borders, Small Gardens
Garden Styles City and Courtyard, Informal and Cottage, Traditional Garden
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Alternative Plants to Consider

Sorbus intermedia (Swedish Whitebeam)
Sorbus torminalis (Wild Service Tree)
Sorbus thibetica ‘John Mitchell’ (Tibetan Whitebeam)
Sorbus americana (American Mountain Ash)
Sorbus aucuparia (European Mountain Ash)
Sorbus pseudohupehensis ‘Pink Pagoda’ (Chinese Mountain Ash)

Recommended Companion Plants

Aster amellus ‘Violet Queen’ or ‘Veilchenkönigin’ (Italian Aster)
Aconitum carmichaelii ‘Arendsii’ (Monkshood)
Miscanthus sinensis ‘Yakushima Dwarf’ (Chinese Silver Grass)
Helenium ‘Sahin’s Early Flowerer’ (Sneezeweed)

Find In One of Our Guides or Gardens

A Pretty Late Season Border Idea with Asters, Helenium, and Grasses
Small Trees and Shrubs That Attract Birds
Green Canopy, Better World: Exploring the Benefits of Trees
Trees that Invite Wildlife to Your Garden
Spectacular Trees for Vibrant Fall Colors: A Gardener’s Guide
Native Plant Alternatives to Sorbus aucuparia (European Mountain Ash)
While every effort has been made to describe these plants accurately, please keep in mind that height, bloom time, and color may differ in various climates. The description of these plants has been written based on numerous outside resources.
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Requirements

Hardiness 7 - 8
Heat Zones 7 - 8
Climate Zones 2A, 2B, 3A, 3B, 4, 5, 6, 7, 8, 9, 10, 14, 15, 16, 17
Plant Type Trees
Plant Family Rosaceae
Genus Sorbus
Common names Ash, Mountain Ash
Exposure Full Sun
Season of Interest Spring (Late)
Summer (Early, Mid, Late)
Fall
Height 15' - 30'
(4.6m - 9.1m)
Spread 6' - 20'
(180cm - 6.1m)
Spacing 240" (6.1m)
Maintenance Low
Water Needs Average
Soil Type Clay, Loam, Sand
Soil pH Acid, Neutral
Soil Drainage Moist but Well-Drained, Well-Drained
Characteristics Showy
Garden Uses Beds And Borders, Small Gardens
Garden Styles City and Courtyard, Informal and Cottage, Traditional Garden
How Many Plants
Do I Need?
Explore Great Plant Combination Ideas
Sorbus (Rowan)
Guides with
Sorbus (Rowan)
Not sure which Sorbus (Rowan) to pick?
Compare Now

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