Narrowleaf Cottonwood
Populus angustifolia
Salicaceae · broadleaf deciduous tree · native
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Populus angustifolia (Salicaceae) is a deciduous tree native to the mountains and stream corridors of western North America. It grows 50 to 70 feet tall with a narrow, upright crown and slender, willow-like leaves (narrower than other cottonwoods). The bark is smooth and greenish on young trees, becoming gray and furrowed with age.
Narrowleaf cottonwood is a riparian species that colonizes stream banks and moist mountain valleys at moderate to high elevations. It grows rapidly in full sun with ample moisture. Like all cottonwoods, female trees produce abundant cotton-like seed floss. Hardy in Zones 3a to 8b.
Quick Facts
Phenological Calendar
| Stage | Typical Window |
|---|---|
| Bud break BBCH 07 | May 15-Jun 15 |
| Leaf emergence BBCH 11 | Jun 1-Jul 1 |
| Bloom start BBCH 61 | Mar 15-May 15 |
| Bloom end / petal fall BBCH 69 | Apr 15-May 31 |
| Fruit/seed development BBCH 71 | Jun 1-Aug 31 |
| Fall color / leaf senescence BBCH 93 | Oct 1-Nov 15 |
| Dormancy BBCH 97 | Nov 15-Feb 28 |