Black Cottonwood (Populus trichocarpa)

Black Cottonwood

Populus trichocarpa

Tall, fast-growing deciduous tree with shimmering foliage. Provides shade and wildlife habitat; common name: black cottonwood.

Full sun
1–2/week
Moderate
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Plant Needs

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Sunlight Full sun is preferred for optimal growth; tolerates partial shade but may grow slower with reduced sunlight
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Watering Water deeply during dry periods for young trees; established mature trees tolerate moderate drought conditions
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Temperature Cold-hardy to subzero temperatures; withstands summer heat in temperate and cool climate zones
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Characteristics

  • Leaf: Triangular to heart-shaped, glossy green above, pale silvery below, with flattened petioles that cause foliage to shimmer in wind
  • Flower: Dioecious catkins; male catkins are reddish, female catkins are greenish-yellow
  • Stem/Bark: Young bark smooth, gray-green; mature bark deeply furrowed, dark brown
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Care Guide

Watering

Water young trees weekly during dry spells; established trees need supplemental water only during prolonged drought

Fertilization

Apply balanced slow-release fertilizer once at bud break. Young trees may benefit from a second light feeding in early summer

Composted banana peel tea:Compost banana peels for 2–3 weeks, steep in water for 24 hours, dilute 1:20 before applying as a root drench to avoid nutrient burn
Pruning
  • Remove dead, damaged, or crossing branches in late winter to improve tree structure and airflow
  • Trim suckers growing from the base to prevent overcrowding and redirect energy to the main trunk
  • Thin dense upper branches to reduce wind resistance and prevent breakage during storms
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA-verified non-toxic to cats; no adverse effects from ingestion or contact

Humans: No documented toxicity to humans; safe for casual contact and handling

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Garden Uses & Culture

Culture: Symbolizes resilience and rapid growth in riparian forest ecosystems of Western North America

Usage: Timber production for plywood and paper; erosion control along stream banks; wildlife shelter for birds and insects