Papuan Ant Plant (Hydnophythum papuanum)

Papuan Ant Plant

Hydnophythum papuanum

It hosts symbiotic ants in its swollen caudex, a quiet ecological partnership. Epiphytic myrmecophyte; common name: Papuan Ant Plant.

Partial sun
1–2/week
Moderate
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Plant Needs

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Sunlight Bright indirect light; avoid direct midday sun which can scorch delicate leaves
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Watering Water thoroughly when the top 2 cm of substrate is dry; avoid overwatering to prevent caudex rot
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Temperature Thrives in warm, humid conditions; avoid temperatures below 15°C which can trigger leaf drop
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Characteristics

  • Leaf: Glossy, elliptical evergreen leaves, 5–10 cm long, arranged oppositely on trailing stems
  • Caudex: Swollen, hollow basal stem structure that forms specialized ant domatia
  • Flower: Tiny, pale white to cream tubular flowers clustered at stem nodes
  • Fruit: Small, fleshy white berries, rarely produced in indoor cultivation
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Care Guide

Watering

Keep substrate evenly moist but not waterlogged; mist regularly to maintain 60–70% humidity

Fertilization

Diluted balanced liquid fertilizer every 4 weeks. Avoid over-fertilizing to prevent leaf burn and caudex damage

Banana peel compost tea:Steep fully composted banana peels in water for 24 hours; dilute 1:20 for root drench to avoid burning delicate epiphytic roots
Pruning
  • Trim yellowing or damaged leaves at the base to maintain plant health and airflow
  • Pinch back trailing stem tips to encourage bushier, more compact growth
  • Remove dead flower clusters to redirect energy to caudex development
  • Avoid cutting into the swollen caudex as it can damage the symbiotic ant habitat
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: Not listed as toxic to cats by the ASPCA

Humans: No documented toxicity to humans per available authoritative sources

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Garden Uses & Culture

Culture: N/A

Usage: Ornamental epiphyte for terrariums or hanging baskets; subject of symbiosis ecological research