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Christmas fern

Polystichum acrostichoides · Dryopteridaceae

The gardener's calendar

The right move for September

Ideal time to plant christmas fern: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.

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ID card

Foliage
Semi-evergreen to evergreen depending on climate
Adult size
16 to 24 inches tall, 12 to 18 inches wide
Growth
Slow to moderate
Hardiness
Very hardy, down to -4°F
Origin
Forests of North America (Eastern United States and Canada)
Soil type
Humus-rich, well-drained, slightly acidic
Exposure
Shade to partial shade

Care

Light Exposure

This fern prefers shade or partial shade, ideal under tree cover or on the north side of your garden. It tolerates direct sun poorly—it will dry out the fronds. Shaded exposure in summer is recommended, even in temperate regions.

Watering

Keep the soil consistently moist but not waterlogged. During the growing season (spring and summer), water regularly to keep the substrate fresh. In winter, reduce watering based on climate conditions, but avoid letting the soil dry out completely.

Soil Preparation

Use soil rich in organic matter, enriched with peat or compost. Ensure good drainage by adding sand or perlite if needed. A slightly acidic pH promotes better growth.

Pruning and Cutting

Regularly remove dead or damaged fronds at the base of the rhizome. Avoid drastic pruning; the fern regenerates naturally over time. In early spring, clean up debris from the previous year.

Fertilizing

Apply diluted fertilizer for shade plants once or twice monthly in spring and summer. Prefer organic amendments (compost or bone meal) to gradually enrich the soil without risk of burn.

Diseases and Pests

These ferns are quite resistant to diseases. Watch for scale insects and spider mites indoors. Excess standing moisture can promote rot; good air circulation in the area is essential.

Did you know?

The Christmas fern got its curious name because its sporangia, visible on the underside of the fronds, resemble those of the Acrostichum genus, though it isn't related to it. This fern is highly prized by North American gardeners for beautifying shaded woodlands and creates persistent green carpets that delight the eye even in winter.

Where to buy it

Plant in spring or early autumn, avoiding spells of intense heat. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, April, May, September.

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Tips generated and checked by Viridia — adapt them to your local climate.