Diamond fern (Lophosoria quadripinnata)

Diamond fern

Lophosoria quadripinnata

A magnificent ancient fern with lacy, quadripinnate fronds that reveal a striking silvery-blue underside. Evergreen foliage plant; other names: ampe, palmilla.

Prefers dappled shade or indirect light; avoid harsh direct afternoon sun which can scorch the fronds.
2/week
Moderate
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Plant Needs

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Sunlight Prefers dappled shade or indirect light; avoid harsh direct afternoon sun which can scorch the fronds.
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Watering Requires consistently moist soil; do not allow the root zone to dry out completely.
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Temperature Thrives in cool to temperate climates; tolerates light frosts but struggles in extreme heat.
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Characteristics

  • Fronds: Large, arching, up to 3-4 meters long, quadripinnate (highly divided), dark green above and distinctly glaucous (silvery-white) below;
  • Rhizome: Stout, creeping to ascending, sometimes forming a short trunk up to 1 meter tall, densely covered with soft, pale brownish hairs rather than scales;
  • Sori: Round, naked (lacking an indusium), located on the undersides of the ultimate leaf segments.
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Care Guide

Watering

Keep soil consistently moist but not waterlogged, watering deeply when the top inch feels slightly dry.

Fertilization

Apply a weak, balanced organic fertilizer once as new fronds emerge.. Ferns are sensitive to heavy fertilization; use half-strength or highly diluted solutions.

Used Tea Leaves:Scatter used, unflavored tea leaves or grounds around the base to gently boost nitrogen and maintain soil acidity. Avoid thick layers to prevent mold.
Pruning
  • Remove old, brown, or damaged fronds at the base using sterilized secateurs;
  • Do not cut into the main rhizome or crown;
  • Leave healthy green fronds intact to support the plant's energy needs.
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: Non-toxic to cats per general fern safety guidelines.

Humans: Non-toxic to humans, though not considered edible.

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Garden Uses & Culture

Culture: In South America, particularly in Chile, the fronds have been historically used by local communities for thatching and temporary shelters, while the plant itself became admired in Victorian-style fernery gardens in Europe.

Usage: - **Ornamental**: Excellent architectural plant for woodland gardens and shaded borders; - **Ecological**: Acts as a pioneer species in disturbed cloud forests, stabilizing soil.