Black Spleenwort (Asplenium adiantum-nigrum)

Black Spleenwort

Asplenium adiantum-nigrum

Delicate fronds unfurl like lace in shade, a quiet groundcover gem. Evergreen fern; common name: Black Spleenwort.

Low light
2–3/week
Beginner
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Plant Needs

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Sunlight Prefers deep to partial shade; direct sunlight will scorch delicate fronds
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Watering Keep soil consistently moist but not waterlogged; avoid allowing the growing medium to dry out completely
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Temperature Thrives in cool to temperate conditions; tolerates brief light frost without permanent damage
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Characteristics

  • Frond: Triangular, finely divided dark green foliage; stipe base is black and scaly
  • Sori: Round, clustered spore-producing structures on underside of frond segments
  • Habit: Tight clumping, low-growing evergreen fern
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Care Guide

Watering

Keep soil evenly moist; mist fronds to boost ambient humidity

Fertilization

Diluted balanced feed every 6 weeks. Avoid over-fertilizing, as this can damage frond growth

Composted eggshell tea:Steep fully composted crushed eggshells in water for 3 days; dilute 1:20 before applying as a root drench to avoid nutrient buildup
Pruning
  • Remove brown, dead fronds at the base to improve airflow and tidy appearance
  • Trim damaged frond tips to maintain a neat, uniform shape
  • Divide overcrowded clumps in early spring to propagate and refresh the plant
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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 shade groundcover, indoor terrarium plant, rock garden accent