northern mountain ash
Sorbus decora · Rosaceae
northern mountain ash (Sorbus decora) is a perennial tree in the Rosaceae family. It is native to North America. USDA records it as hardy in zone 2 and warmer, down to about -50°F.
At a glance
| Type | tree Derived |
|---|---|
| Lifecycle | perennial USDA |
| Native status | native USDA |
| Mature height | 40 ft USDA |
| Light | shade USDA |
| Water need | low USDA |
| Growth rate | slow USDA |
| Soil pH | 4–7 USDA |
| Bloom | June USDA |
| Flower color | White USDA |
| Hardiness zones | 2 and warmer USDA |
| Guild layer | canopy Derived |
| Nursery availability | Routinely Available USDA |
USDA quoted from the USDA PLANTS database · Derived computed by a fixed rule from those columns. No value on this page is estimated.
Growing conditions
It tolerates full shade. USDA rates it as having low water needs once established. Its drought tolerance is rated low. It is recorded on soils from pH 4 to 7 — a broad range that spans acidic through mildly alkaline ground. Its cold limit is zone 2.
Size and growth
At maturity it reaches about 40 ft, making it a substantial woody plant. It grows slowly.
Bloom period
USDA records a bloom period of June. Flowers are white.
A flowering date, not a pollinator rating.
Foliage, flower and season
Summer foliage is gray-green, fine in texture. Its flowers are conspicuous. It carries conspicuous autumn colour. Its fruit or seed heads are conspicuous, extending interest past flowering. Its active growth period is summer and fall. USDA rates its lifespan as short, so plan on replacing or resowing it rather than treating it as permanent structure.
What the site needs to provide
USDA records it across sites receiving 16 to 51 inches of annual precipitation. It needs at least 88 frost-free days to finish its season. It roots to at least 36 inches. Fertility requirement: medium.
Propagating it
Seed is the only propagation method USDA lists. Division and cuttings are not listed as options. Seed needs cold stratification — a period of moist chilling — before it will germinate, so sow in autumn or chill it artificially before a spring sowing. Its seed spreads at a moderate rate. It spreads vegetatively at a slow rate.
Resilience and wildlife
Browsing animals find it moderately palatable, so expect deer and rabbits to take an interest. Its fire tolerance is rated medium. Its growth form is recorded as single crown.
Role in a guild
Canopy. In a layered planting this is the tallest layer of a planting — it sets the light budget everything beneath it lives on. The layer is derived by a fixed rule from growth habit and mature height.
Tags
Related plants
Others in Sorbus
- American mountain ash Sorbus americana
- European mountain ash Sorbus aucuparia
- Greene's mountain ash Sorbus scopulina
- western mountain ash Sorbus sitchensis
Similar role and hardiness
- boxelder Acer negundo
- red maple Acer rubrum
- silver maple Acer saccharinum
- sugar maple Acer saccharum
- bitternut hickory Carya cordiformis
Where this data comes from
Every value on this page comes from the USDA PLANTS database record for symbol SODE3, or is computed from those values by a fixed rule. Nothing here is estimated or model-generated. Where USDA publishes no value, this page omits the claim rather than filling the gap.
- Quoted from USDA PLANTS: active growth period, Bloom, Bloom end, browse palatability, cold stratification, Drought tolerance, Edible, fall conspicuous, fertility requirement, fire tolerance, Flower color, flower conspicuous, foliage color, foliage porosity winter, foliage texture, frost free days min, fruit conspicuous, growth form, Growth rate, Hardiness zones, Lifecycle, lifespan, Light, Mature height, Minimum temperature, Native status, Nitrogen fixation, Nursery availability, precipitation max in, precipitation min in, propagation, resprout ability, root depth in, seed spread rate, Soil pH, Soil pH (upper), Tolerance of wet soil, Toxicity, vegetative spread rate, Water need.
- Derived by a fixed rule from those columns: Guild layer, Type.
Read our full data sources and methodology.
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