Bog asphodel
Narthecium ossifragum · Nartheciaceae
The gardener's calendar
Ideal time to plant bog asphodel: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.
ID card
- Foliage
- Deciduous, light green
- Flowering
- June to August, golden yellow flowers
- Adult size
- 20 to 40 cm tall
- Growth
- Slow to moderate
- Hardiness
- Very hardy, down to -15°C
- Origin
- Peatlands and wetlands of Northern Europe
- Soil type
- Peaty, acidic, very moist
Care
Watering
Narthecia requires constant moisture, especially during the growing season. Keep the soil wet without creating prolonged waterlogging. In pots, water regularly with soft or rainwater, as it is sensitive to lime.
Light
Prefer a position in dappled shade to partial sun. Overly intense light risks drying out the delicate foliage. A location on the edge of a damp area or near a pond suits it perfectly.
Soil
Demand very acidic substrate rich in organic matter: blonde peat compost, sphagnum moss, or peat mix. Adding coarse sand improves drainage while preserving moisture. Avoid chalky soils at all costs.
Fertilizer
No fertilizer is necessary. Narthecia draws its nutrients from naturally nutrient-rich organic matter. Excessive feeding can upset its growth balance.
Pruning and tidying
No formal pruning is required. Simply remove dead or damaged foliage in late winter to encourage spring growth. Cut back spent flower stems if you wish to extend the flowering period.
Pests and diseases
Narthecia is generally resistant in its natural environment. Waterlogging or poor air circulation can promote rot. Watch for occasional aphids. Always maintain good air circulation around the clump.
Did you know?
The name "ossifragum" literally means "bone-breaker" in Latin. This evocative name comes from an old Scottish and Irish belief that narthecia leaves would cause the bones of animals that ate them to fall out. Although this legend has no botanical basis, it testifies to the fearful respect that this plant of wild peatlands inspired in local populations.
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.