Narrowleaf Cottonwood

Populus angustifolia

Salicaceae · broadleaf deciduous tree · native

Last updated

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

Height
50–65 ft
Growth Rate
Fast
Light
Full Sun
Soil
Wet Tolerant
Water
High
Hardiness
Zone Zones 3a–8b
Bloom Time
Mar 15-May 15
Origin
Pacific Northwest native
Watch for this season

Spring Infection Period

Spring Canker Activation

Spring Spore Germination and Infection

Oystershell scaleHigh

Crawler Emergence

+ 8 more — see full disease and pest lists below

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

Diseases: Regionally Documented (17)

Pests: Regionally Documented (14)

Data Maturity
Structured Multiple sources. Expert review underway.