Crested Formosan Polypody (Polypodium formosanum 'Cristatum')

Crested Formosan Polypody

Polypodium formosanum 'Cristatum'

Crested fronds unfurl like ruffled green lace, a delicate fern for shaded nooks. Evergreen epiphytic fern; common name: Crested Formosan Polypody.

Low light
1–2/week
Beginner
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Plant Needs

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Sunlight Bright indirect or filtered shade; avoid direct sunlight which can scorch delicate fronds
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Watering Keep growing medium evenly moist but not waterlogged; allow the top 1 cm of medium to dry between waterings
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Temperature Thrives in 15–22°C; avoid cold drafts and temperatures below 10°C to prevent frond browning
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Characteristics

  • Frond: Crested, ruffled bright green fronds, pinnately divided with crested terminal tips
  • Rhizome: Creeping, scaly brown rhizomes that anchor to bark or rock surfaces
  • Sori: Clustered spore-producing structures on undersides of mature fronds
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Care Guide

Watering

Maintain consistent moisture; mist fronds 2–3 times weekly to boost humidity

Fertilization

Diluted balanced liquid feed once every 6 weeks. Avoid over-fertilization to prevent frond burn; cease feeding in autumn and winter

Spent tea leaf compost tea:Steep fully composted spent black tea leaves in water for 24 hours, dilute 1:20 for root drench; discard solid leaves to avoid mold growth
Pruning
  • Trim browning frond tips with clean scissors to maintain a tidy appearance
  • Remove completely dead, yellowed fronds at the base to improve airflow
  • Divide overcrowded rhizome clumps in spring to propagate new plants
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA-verified non-toxic to cats; no reported poisoning cases

Humans: Non-toxic to humans; no known adverse health effects from handling or ingestion

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Garden Uses & Culture

Culture: N/A

Usage: Ornamental epiphyte for terrariums, hanging planters, or shaded rock gardens