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Black Cottonwood


Common Name(s): Black Cottonwood

Scientific Name: Populus trichocarpa

Distribution: Northwestern North America

Tree Size: 80-150 ft (25-45 m) tall, 5-6 ft (1.5-2.0 m) trunk diameter

Average Dried Weight: 24 lbs/ft3 (385 kg/m3)

Specific Gravity (Basic, 12% MC): .31, .38

Janka Hardness: 350 lbf (1,560 N)

Modulus of Rupture: 8,500 lbf/in2 (58.6 MPa)

Elastic Modulus: 1,270,000 lbf/in2 (8.76 GPa)

Crushing Strength: 4,500 lbf/in2 (31.0 MPa)

Shrinkage: Radial: 3.6%, Tangential: 8.6%, Volumetric: 12.4%, T/R Ratio: 2.4