Rusty woodsia
Woodsia ilvensis · Woodsiaceae
The gardener's calendar
Ideal time to plant rusty woodsia: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.
ID card
- Family
- Woodsiaceae
- Type
- Fern
- Foliage
- Deciduous
- Mature size
- 15 to 30 cm tall
- Growth
- Slow
- Hardiness
- Very hardy (down to -20 °C)
- Origin
- Mountainous regions of Europe, Asia and North America
- Exposure
- Partial shade to shade
Care
Exposure
This fern prefers partial shade or dappled shade, just as in its natural mountainous habitat. Avoid full sun which can scorch its delicate fronds. A location sheltered from strong winds is ideal to protect this fragile species.
Soil
Woodsia ilvensis thrives in well-draining, slightly acidic soil rich in humus. Incorporate compost or decomposed organic matter when planting. Rocky soil with pockets of fertile earth reproduces its natural mountainous conditions nicely.
Watering
Keep the soil moist but not waterlogged. Water regularly during the growing season (spring and summer), especially in dry weather. In winter, reduce watering as the foliage is deciduous and the plant goes dormant.
Feeding
A light application of well-decomposed compost in spring is sufficient for this undemanding fern. Avoid concentrated mineral fertilizers which risk burning delicate roots. An organic mulch of fallen leaves complements natural nutrition effectively.
Pruning and maintenance
No pruning is necessary. Simply remove dead or damaged fronds as they appear. In spring, gently clean debris around the crown to encourage new frond emergence.
Diseases and pests
This fern is generally hardy and not prone to disease. Watch for excessive moisture which can encourage root rot. Aphids and spider mites are rare; if needed, use sprayed water or mild solutions to control them.
Did you know?
Woodsia ilvensis takes its scientific name from the island of Elba (Ilva in Latin), although this tiny fern is distributed much more widely in mountainous regions around the world. It's a pioneer plant that colonizes rocky walls and crevices, playing an important role in ecological succession in alpine zones. Its extreme hardiness and ability to survive in the most inhospitable environments make it a valuable species for rare fern enthusiasts and rock gardens.
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
- Physematium obtusumPhysematium obtusum
- Alpine woodsiaWoodsia alpina
- LavenderLavandula angustifolia
- Fig treeFicus carica
- RosemarySalvia rosmarinus
- Japanese mapleAcer palmatum
Tips generated and checked by Viridia — adapt them to your local climate.