California Maidenhair Fern (Adiantum jordanii)

California Maidenhair Fern

Adiantum jordanii

Delicate fronds unfurl like lacy green lacework, softening shaded spaces. Evergreen fern; common name: California maidenhair fern.

Low light
2–3/week
Moderate
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Plant Needs

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Sunlight Bright indirect light or dappled shade; direct sunlight will scorch the delicate fronds
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Watering Keep soil consistently moist but not waterlogged; use room-temperature, chlorine-free water to avoid leaf tip browning
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Temperature Thrives in cool to temperate temperatures; avoid sudden temperature fluctuations and drafty areas
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Characteristics

  • Frond: Delicate fan-shaped leaflets arranged on thin, glossy black wiry stalks
  • Stem: Rhizomatous, glossy black wiry stems that spread slowly to form clumps
  • Sori: Spore-producing clusters located on the margins of leaflets, covered by folded leaf tissue
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Care Guide

Watering

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

Fertilization

Diluted balanced liquid feed every 6 weeks. Avoid over-fertilizing, as this can cause leaf tip browning

Banana peel compost tea:Compost banana peels fully to break down nutrients; dilute 1:20 with water for root drenching to support frond growth without burning delicate roots
Pruning
  • Trim browned frond tips with sharp, sterile scissors to maintain a tidy appearance
  • Remove fully dead fronds at the base to improve airflow and reduce pest risk
  • Divide overcrowded clumps in spring to propagate and refresh the growing medium
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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 foliage for shaded indoor planters, terrariums, and temperate garden understory