Oak fern
Gymnocarpium dryopteris · Cystopteridaceae
The gardener's calendar
Ideal time to plant oak fern: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.
ID card
- Foliage
- Deciduous, very finely cut
- Adult size
- 20-30 cm tall, 30-40 cm spread
- Growth
- Slow to moderate
- Hardiness
- Very hardy, down to -20 °C
- Exposure
- Shade to partial shade
- Soil type
- Moist, rich in humus, well-drained
- Origin
- Temperate regions of Eurasia and North America
Care
Watering
Keep the soil consistently moist, especially during the growing season. Ferns dread prolonged drought and stagnant water. In winter, gradually reduce watering without letting the substrate dry out completely.
Exposure
Place this fern in shade or partial shade, away from direct sunlight which scorches the foliage. It thrives under tree cover or near a north-facing window. Avoid overly bright exposures.
Soil and substrate
Choose soil rich in organic matter, light and well-drained. Mix in decomposed compost or blonde peat to improve moisture retention. A slightly acidic substrate is ideal.
Pruning and cleaning
Remove wilted or damaged fronds regularly as they appear. Clean up dead foliage at the end of winter before new growth begins. This fern requires no formal pruning.
Fertilizer
Apply a balanced, highly diluted fertilizer every 2-3 months from May to September. Ferns prefer light and regular feeding. Avoid overdosing which risks burning delicate roots.
Diseases and pests
Watch for spider mites in dry air and scale insects under the fronds. Appropriate ambient humidity limits these problems. Ensure good air circulation to prevent fungal diseases.
Did you know?
Dryopteris filix-mas is named after Carl von Linné, the Swedish naturalist who founded binomial nomenclature. This fern is a relic of ancient European forests: its ultra-finely cut fronds are a true marvel of natural geometry, with each pinnule dividing in a delicate cascade that seems straight out of a classical botanical work.
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.
Add this plant to my garden →Plants from the same family
- Gymnocarpium robertianumGymnocarpium robertianum
- Mountain bladderfernCystopteris montana
- Bulblet fernCystopteris bulbifera
- CamelliaCamellia japonica
- Pedunculate oakQuercus robur
- GrapevineVitis vinifera
Tips generated and checked by Viridia — adapt them to your local climate.