Poisonwood (Metopium toxiferum)

Poisonwood

Metopium toxiferum

Its sap carries severe skin irritants, a silent warning in tropical forests. Deciduous tree; common names: poisonwood, hog gum.

Full sun
1–2/week
Moderate
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Plant Needs

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Sunlight Full sun to partial shade; tolerates dappled tropical sunlight, but full sun supports optimal growth
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Watering Water deeply when the top 15 cm of soil dries out; drought-tolerant once established, avoid waterlogged soil
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Temperature Thrives in warm tropical/subtropical temperatures; cannot tolerate frost below 10°C, which causes leaf drop and stem damage
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Characteristics

  • Leaf: Compound pinnate leaves with 3–7 elliptical leaflets; glossy green, turning yellow/red in autumn
  • Flower: Small, greenish-white clustered panicles; inconspicuous and non-ornamental
  • Stem/Bark: Gray-brown, furrowed bark; exudes milky sap that darkens to black on air exposure
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Care Guide

Watering

Water regularly during prolonged dry spells; ensure soil drains freely to prevent root rot

Fertilization

Apply a balanced slow-release fertilizer once at the start of growing season. Do not over-fertilize, as excessive nutrients can reduce drought tolerance

Composted banana peel tea:Steep fully composted banana peels in water for 24 hours; dilute 1:20 before applying as a root drench; avoid contact with foliage to prevent irritation
Pruning
  • Remove dead, damaged, or crossing branches in late winter before new growth emerges
  • Thin crowded canopy branches to improve airflow and reduce fungal disease risk
  • Wear protective gloves and clothing during pruning to avoid sap contact; dispose of pruned material carefully to prevent accidental exposure
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Toxic via contact or ingestion; causes oral blistering, vomiting, skin inflammation, and difficulty swallowing

Humans: Contains urushiol resin; causes severe contact dermatitis, blistering, and swelling; smoke from burning wood triggers respiratory irritation

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Garden Uses & Culture

Culture: N/A

Usage: N/A