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The American Mountain Ash typically grows to a height of 20 to 40 feet (6 to 12 meters) with a spread of 15 to 30 feet (4.5 to 9 meters). It has an upright, rounded crown and a slender trunk. The leaves are pinnately compound, with 9 to 15 leaflets that are elliptical and serrated along the edges. In the fall, the leaves turn vibrant shades of orange, red, or yellow.
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Growing Conditions: American Mountain Ash thrives in full sun to partial shade. It prefers moist, well-drained soil but can tolerate a range of soil types, including sandy or clay soils. It is hardy in USDA hardiness zones 3 to 6.
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Maintenance: Once established, American Mountain Ash is relatively low-maintenance. It requires regular watering, especially during dry periods, to keep the soil consistently moist. Mulching around the base of the tree helps retain moisture and suppress weeds. Pruning is generally not necessary, but you can remove any dead or damaged branches as needed.
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Type: |
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Origins: |
Appalachians and NE North America |
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Height: |
15' - 30' |
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Spread: |
15’ - 25' |
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Spacing: |
20' |
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USDA Hardiness Zone: |
2 - 6 |
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Culture: |
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Bloom Color: |
White |
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Season of Interest: |
MAINTENANCE NEEDS: Low Maintenance. Bacterial fireblight can be a severe problem, and Scab can cause significant defoliation. Cankers, crown gall, powdery mildew and rust may also occur. Potential pests include borers, aphids, sawfly and scale. Stressed trees are generally more susceptible to attack from canker and borers.
LANDSCAPE USES: Accents or Group Plantings, Borders, Naturalized Areas, Wildlife Garden, Foundation Plantings, and Containers.
COMPANION PLANTS: Juniper, Rudbeckia, Geranium
IMAGES: Photo by Chris M Morris, American mountain ash, (2) Photo by Doug McGrady, Sorbus americana (American mountain-ash), Acadia NP, ME, (3) Photo by Superior National Forest, Sorbus americana 5-eheep, (4) Superior National Forest, Sorbus americana 6 (5098095672), CC BY 2.0, (5) Fungus Guy, Sorbus americana, Whitefish Island 2, CC BY-SA 3.0
*As plants have ranges in appearance they may not appear as the images shown.
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