Oakleaf Mountain Ash
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A deciduous ornamental tree known for its narrow, upright columnar habit and striking seasonal interest. In spring, it produces clusters of creamy white flowers that attract pollinators, followed in late summer to fall by bright orange-red berries that persist into winter, providing food for birds. Its pinnate green foliage turns shades of yellow, orange, and red in autumn, adding vibrant seasonal colour.
Valued for its columnar form, multi-season interest, and wildlife attraction, it grows best in full sun and prefers well-drained soil. Once established, it tolerates urban conditions, including wind and pollution. Minimal pruning is needed to maintain shape or remove dead wood.
| Fall Colour | Rusty Orange |
|---|---|
| Shape | Pyramidal |
| Sun Exposure | Full Sun |
| Fruit | Fruit (Orange) |
| Latin Name | Sorbus thuringiaca 'Fastigiata' |
| Soil Conditions | Moist / Well Drained |
| Flower Colour | White |
| Mature Height ** | 7 Meters - 23 Feet |
| Mature Width ** | 3 Meters - 10 Feet |
| Growth Rate | Average |
| Zone | 5 |
| Native | No |
** Maturity Heights and Widths are listed to show what this plant can grow to in warmer climates and over the course of centuries. For landscape purposes in Ontario, take this value at 50% for appropriate spacing in your garden for immediate install purposes / for the next 10-20 years.