Populus trichocarpa

Family: Salicaceae

Common Name: black cottonwood

Origin/Ecology: Native to BC

Habit: Stiffly upright, grows over 30 m tall, 15 m wide.

Leaves: Broadly ovate, wavy margins, underside silvery with brown spots (resin blotches).

Leaf Arrangement: alternate

Flowers and Fruit: Catkins, not showy, Mar-Apr. Capsules, white, brown, not showy, May-Jun.

Bark: Moderately fissured, single stem trunk, grey.

Water Use, Soil: Well-drained soil, low-moderate water.

Exposure: Full sun.

Landscape Uses: Reclamation, wind break.

Limitations: Crown rot, dieback, leaf miner insect, root rot, rust, scale insects.

Other Features: Strongly excurrent. Tallest tree in N. America. Long sticky buds, red resin, contain ~4 preformed leaves. Grows along rivers. Late leaves are much bigger than early leaves.