Spreading woodfern
Dryopteris expansa · Dryopteridaceae
The gardener's calendar
Ideal time to plant spreading woodfern: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.
ID card
- Foliage
- Deciduous
- Adult size
- 24 to 47 inches in height
- Growth
- Moderate
- Hardiness
- Very hardy (down to -4°F)
- Origin
- Northern Hemisphere (North America, Asia, Europe)
- Soil type
- Humus-rich, well-draining, slightly acidic
- Exposure
- Shade to partial shade
Care
Watering
Keep the soil consistently moist, especially during spring and summer growth. This fern enjoys a cool environment and prefers soils that don't dry out completely. In winter, reduce watering slightly but never let the soil dry out entirely.
Light Exposure
Place your upright fern in shade or partial shade, ideally under tree cover or near a north-facing window. It tolerates direct sunlight poorly—harsh rays can burn its delicate fronds. Choose a location sheltered from strong winds.
Soil Preparation
Enrich the soil with compost or peat to improve its structure and moisture retention. Proper drainage is essential to prevent root suffocation. A slightly acidic to neutral pH is ideal for this species.
Pruning and Cleanup
Remove faded or damaged fronds in late fall or early spring. Pinch back young fiddleheads if you wish to limit sprawl. This encourages the emergence of more vigorous new fronds.
Fertilizing
A light annual application of balanced fertilizer in spring is sufficient. Choose fertilizers rich in organic matter or well-decomposed compost mixed into the surface soil. Avoid excess feeding, which can encourage pests.
Pests and Diseases
This fern is generally resistant to disease when grown in optimal conditions. Watch for spider mites in overly dry air and scale insects on fronds. Good air circulation and regular humidity prevent most problems.
Did you know?
The name Dryopteris means "oak fern" in ancient Greek, because this fern naturally grows at the base of oak trees in temperate forests. The upright wood fern is one of the rare ferns with semi-upright fronds that elegantly structure shaded gardens, and it was long prized in floristry for Victorian-style botanical bouquet arrangements.
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
- Scaly Male FernDryopteris affinis
- Soft shield fernPolystichum setiferum
- Sword fernPolystichum munitum
- Autumn fernDryopteris erythrosora
- Japanese holly fernCyrtomium falcatum
- Asian netvein hollyfernCyrtomium fortunei
Tips generated and checked by Viridia — adapt them to your local climate.