Pendulous Adder's-tongue Fern (Ophioglossum pendulum)

Pendulous Adder's-tongue Fern

Ophioglossum pendulum

Its pendulous fronds drape like soft green ribbons. Epiphytic tropical fern; common name: Weeping Adder's-tongue.

Partial sun
2–3/week
Moderate
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Plant Needs

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Sunlight Bright indirect light; avoid direct midday sun to prevent frond scorching
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Watering Keep growing medium consistently moist but not waterlogged; mist fronds regularly to maintain humidity
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Temperature Thrives in warm, humid conditions; avoid temperatures below 15°C to prevent frond browning
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Characteristics

  • Leaf: Two distinct frond types; sterile photosynthetic frond is leathery, lanceolate, pendulous
  • Spore Frond: Slender erect spike with sporangia, growing from the sterile frond's base
  • Stem: Short rhizomatous base with adventitious roots for epiphytic attachment
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Care Guide

Watering

Maintain steady moisture; mist fronds 2–3 times weekly

Fertilization

Diluted balanced feed once every 4 weeks. Avoid over-fertilization to prevent frond tip burn

Spent tea leaf compost tea:Brew fully composted black tea leaves, dilute 1:20 for root drench; discard solid debris to prevent mold growth
Pruning
  • Trim browned or damaged fronds at the base to preserve plant appearance
  • Remove dead spore spikes after spore release to redirect energy to new growth
  • Thin overcrowded fronds to improve air circulation and light penetration
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA confirmed 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: N/A

Usage: Ornamental epiphytic fern for hanging baskets or terrarium displays