Christmas Fern (Polystichum acrostichoides)

Christmas Fern

Polystichum acrostichoides

Its evergreen fronds hold winter’s quiet grace, a steady green in dormant gardens. Evergreen fern; common name: Christmas fern.

Low light
1–2/week
Beginner
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Plant Needs

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Sunlight Partial to full shade; tolerates dappled sunlight in cool climates, avoid direct midday sun to prevent frond scorching.
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Watering Keep soil consistently moist but not waterlogged; allow the top 2 cm of soil to dry slightly between waterings.
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Temperature Extremely cold-hardy, tolerating winter temperatures down to -30°C; prefers cool to temperate growing conditions.
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Characteristics

  • Fronds: Leathery, dark green evergreen fronds with pointed leaflets arranged in a feather-like pattern.
  • Sori: Clustered on undersides of fertile fronds, covered by brown, shield-shaped indusia.
  • Rhizome: Short, creeping underground rhizome forming dense, compact clumps.
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Care Guide

Watering

Keep soil evenly moist; increase watering frequency during prolonged dry spells

Fertilization

Work compost into topsoil once at the start of the growing season. Avoid synthetic fertilizers, as they can damage sensitive rhizomes.

Composted leaf mold:Mix 2–3 inches of fully decomposed leaf mold into the topsoil in early spring; avoid direct contact with frond bases to prevent rot.
Pruning
  • Remove brown, damaged fronds in early spring to clear space for new growth.
  • Thin dense clumps every 2–3 years to improve airflow and reduce overcrowding.
  • Trim frost-damaged foliage in late winter to maintain a tidy appearance.
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Non-toxic to cats

Humans: No known toxic effects on humans

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Garden Uses & Culture

Culture: N/A

Usage: Ornamental shade garden fern; erosion control in woodland settings