Striated Poison Oak (Toxicodendron striatum)

Striated Poison Oak

Toxicodendron striatum

Its urushiol-laden sap hides behind glossy leaves, a quiet hazard. Evergreen shrub in the poison oak genus; common name: Striated Poison Oak.

Partial sun
1–2/week
Moderate
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Plant Needs

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Sunlight Partial shade to filtered sunlight; avoid prolonged direct midday sun which can scorch leaves.
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Watering Keep soil consistently moist but well-drained; avoid waterlogging to prevent root rot.
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Temperature Thrives in warm temperate to tropical climates; protect from frost below 10°C to prevent leaf damage.
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Characteristics

  • Leaf: Trifoliate, glossy green leaves with distinct striated veins; turns reddish in autumn.
  • Flower: Small, greenish-white clustered blooms in axillary racemes.
  • Stem: Hairy young stems; mature stems develop light brown, slightly fissured bark.
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Care Guide

Watering

Maintain consistent soil moisture; water when the top 2 cm of soil feels dry

Fertilization

Apply diluted balanced fertilizer once monthly. Avoid over-fertilization which can promote excessive tender growth that is more susceptible to pest damage.

Composted banana peel tea:Steep fully composted banana peels in water for 24 hours; dilute the mixture 1:20 before applying as a root drench; avoid direct contact with foliage to prevent irritation.
Pruning
  • Wear heavy rubber gloves to avoid contact with urushiol sap during all pruning activities.
  • Remove dead, damaged, or overcrowded branches in late winter to improve airflow and reduce disease risk.
  • Dispose of pruned material carefully; do not burn as smoke can spread urushiol and cause respiratory irritation.
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Toxic; contact or ingestion may cause skin irritation, vomiting, and lethargy.

Humans: Contains urushiol resin; contact causes allergic contact dermatitis in most humans, with varying severity based on sensitivity.

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Garden Uses & Culture

Culture: N/A

Usage: N/A