Australian Tree Fern (Sphaeropteris cooperi)

Australian Tree Fern

Sphaeropteris cooperi

Fronds unfurl like green fists unfurling into lace. Large evergreen tree fern; common names: Australian Tree Fern, Cooper's Tree Fern.

Partial sun
2–3/week
Moderate
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Plant Needs

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Sunlight Bright indirect light; tolerate partial shade; avoid harsh direct midday sun which can scorch frond tips
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Watering Keep soil consistently moist but not waterlogged; maintain high ambient humidity around fronds
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Temperature Thrives in warm, humid conditions; avoid temperatures below 10°C which can cause frond browning and stress
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Characteristics

  • Fronds: Large bipinnate, arching fronds up to 4–6 m long; bright green, delicate lace-like texture
  • Trunk: Slender, covered in persistent brown fibrous frond bases and fine aerial roots
  • Sori: Clusters of spore-producing structures on undersides of mature frond pinnae
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Care Guide

Watering

Keep soil evenly moist; mist fronds daily to boost ambient humidity

Fertilization

Diluted organic feed every 2 weeks. Discontinue fertilization in autumn and winter when growth slows

Composted banana peel tea:Soak fully composted banana peels in water for 24 hours; dilute 1:20 for root drench; avoid raw peels to prevent pest infestations and odor
Pruning
  • Trim brown, dead fronds at the base to maintain appearance and improve airflow
  • Remove loose, decaying frond bases from the trunk to reduce pest habitat
  • Thin overcrowded fronds to allow light penetration to lower foliage layers
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

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

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 focal plant in shaded garden beds or large indoor atriums