Coastal Japanese Holly Fern (Cyrtomium falcatum var. maritimum)

Coastal Japanese Holly Fern

Cyrtomium falcatum var. maritimum

Its leathery fronds hold coastal resilience like a green shield. Evergreen fern; common name: coastal holly fern.

Partial sun
1–2/week
Beginner
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Plant Needs

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Sunlight Bright indirect light; tolerates partial shade, avoids harsh direct coastal sunlight
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Watering Water when top 2 cm of soil dries; avoid waterlogging, tolerates short dry periods
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Temperature Thrives in 10–22°C; hardy to light coastal frost down to 5°C
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Characteristics

  • Frond: Leathery, holly-like pinnae with spiny margins; dark green, arching fronds
  • Rhizome: Short, scaly, creeping underground stem
  • Sori: Clustered on undersides of pinnae, covered by round, brown indusia
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Care Guide

Watering

Keep soil evenly moist; mist fronds to boost humidity in dry coastal winds

Fertilization

Diluted balanced feed every 6 weeks. Cease fertilization in autumn and winter when growth slows

Banana peel compost tea:Use fully composted banana peels, dilute 1:20 for root drench; avoid raw peels to prevent pest infestations
Pruning
  • Remove brown, damaged fronds at the base to maintain plant appearance
  • Thin overcrowded clumps in spring to improve airflow
  • Trim dead frond tips to tidy growth without damaging healthy foliage
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Non-toxic to cats

Humans: No known toxicity to humans

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Garden Uses & Culture

Culture: N/A

Usage: Ornamental coastal groundcover, indoor foliage plant