California Sycamore (Platanus racemosa)

California Sycamore

Platanus racemosa

Bark peels in patchwork layers, painting the sky with broad, lobed leaves. Deciduous shade tree; common name: California Sycamore.

Full sun
1–2/week
Moderate
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Plant Needs

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Sunlight Full sun to partial shade; tolerates hot, dry conditions once established; avoid dense, full shade
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Watering Young trees need regular deep watering; mature, established trees are drought-tolerant, requiring supplemental water only during extreme dry spells
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Temperature Hardy to -10°C; tolerates high summer temperatures up to 40°C with adequate moisture for young specimens
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Characteristics

  • Leaf: Broad, palmately lobed (3–5 lobes), 10–25 cm wide; bright green turning golden-brown in fall
  • Bark: Smooth, mottled white, tan, and gray; peels in irregular patches to reveal new bark underneath
  • Flower: Small, spherical greenish-yellow inflorescences; male and female flowers on separate heads
  • Fruit: Clusters of spherical, brown achenes persisting through winter
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Care Guide

Watering

Young trees: water deeply every 7–10 days; mature trees: water every 2–4 weeks during dry periods

Fertilization

Apply balanced slow-release fertilizer once in early spring. Do not fertilize newly planted trees for the first 12 months

Composted banana peel tea:Compost banana peels for 2–3 weeks, steep in water for 24 hours, dilute 1:20 before applying to root zone; avoid over-application to prevent nutrient burn
Pruning
  • Remove dead, damaged, or crossing branches in late winter to early spring before new growth emerges
  • Thin crowded canopy to improve air circulation and sunlight penetration for lower foliage
  • Avoid heavy pruning; remove only necessary branches to maintain the tree's natural spreading shape
  • Clean pruning tools with rubbing alcohol between cuts to prevent disease transmission
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Non-toxic to cats; no reported toxicity symptoms

Humans: Non-toxic to humans; no known adverse health effects from ingestion or contact

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Garden Uses & Culture

Culture: Symbolizes resilience and adaptability in arid Western US landscapes

Usage: Large shade tree for parks and residential gardens; wood used for furniture and traditional Indigenous basketry