Madagascar Strychnine Tree (Strychnos madagascariensis)

Madagascar Strychnine Tree

Strychnos madagascariensis

Its fruits hide deadly alkaloids beneath vibrant skin. Evergreen tropical tree; common name: Madagascar strychnine tree.

Full sun
2–3/week
Moderate
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Plant Needs

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Sunlight Thrives in full sun to partial shade; provide midday shade in intensely hot tropical regions to prevent leaf scorch
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Watering Keep soil consistently moist but well-drained; avoid waterlogging to prevent root rot
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Temperature Requires warm tropical temperatures; cannot tolerate frost or temperatures below 15°C
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Characteristics

  • Leaf: Opposite, elliptical, glossy dark green leaves with smooth margins
  • Flower: Small, creamy-white, fragrant clustered flowers
  • Fruit: Round, orange-red berries containing highly toxic seeds
  • Stem: Gray-brown, moderately textured bark
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Care Guide

Watering

Keep soil evenly moist; water deeply when the top 2 cm of soil feels dry

Fertilization

Apply balanced organic fertilizer once monthly. Avoid over-fertilization to prevent excessive foliage growth at the expense of flowering

Composted banana peel tea:Steep fully composted banana peels in water for 24 hours; dilute 1:20 for root drench; discard solid materials to avoid pest infestations and odors
Pruning
  • Remove dead, diseased, or damaged branches in early spring to promote healthy growth
  • Thin overcrowded inner branches to improve airflow and light penetration
  • Trim to maintain desired tree shape; avoid heavy pruning of mature specimens to prevent stress
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA-listed toxic; ingestion leads to seizures, muscle rigidity, respiratory failure, and possible death

Humans: Contains strychnine and brucine alkaloids; ingestion causes severe neurological damage, potentially fatal without emergency care

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Garden Uses & Culture

Culture: N/A

Usage: Highly regulated traditional medicinal use; ornamental cultivation in controlled, secure outdoor settings