Carex lasiocarpa
Carex lasiocarpa · Cyperaceae
The gardener's calendar
Ideal time to plant carex lasiocarpa: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.
ID card
- Foliage
- Evergreen, fine and linear
- Blooming
- Spring to early summer (April-June)
- Adult size
- 30-60 cm tall, 20-30 cm spread
- Growth
- Slow to moderate
- Hardiness
- Very hardy (zone 3-4, down to -30°C)
- Origin
- Temperate and boreal Europe, wetland areas
- Soil type
- Acidic to neutral, moist to very moist
- Exposure
- Partial shade to light shade
Care
Watering
The thread-leaf sedge loves constantly moist to very wet soils. In standard gardening, keep the substrate moist without prolonged saturation. In dry climates, water regularly especially in summer. This plant thrives at the edges of ponds or in peaty soil where it benefits from natural moisture.
Exposure
Prefer partial shade or light shade. Full sun exposure is possible in very humid regions, but the foliage remains more elegant and denser in shade. Avoid overly sheltered spots where moisture stagnates excessively.
Soil and substrate
Choose acidic to slightly acidic soil, rich in organic matter and especially moist to waterlogged. The sedge will tolerate chalky or compact soils poorly. Adding peat or acidic compost at planting time optimizes establishment.
Pruning and maintenance
Little pruning needed. Light cutting back in early spring (February-March) removes dry leaves and stimulates growth. You can manually remove dead or misshapen tufts. Avoid drastic cuts that weaken the plant.
Fertilizer
Generally not very demanding. In poor soil, a moderate application of organic fertilizer in spring is sufficient. Favor natural amendments (compost, peat) rather than concentrated mineral fertilizers, which can disrupt the acid-base balance.
Diseases and pests
Very resistant to disease in appropriate conditions. Risks increase in cases of prolonged water stagnation or conditions too dry. Occasionally watch for mealybugs or spider mites in enclosed environments (greenhouse). Good surface drainage prevents most fungal problems.
Did you know?
The thread-leaf sedge is a key player in boreal peatlands and marshes of Northern Europe. Its scientific name "lasiocarpa" means "hairy fruits," a subtle botanical characteristic visible under magnification. In ecological management, this sedge is often used to restore degraded wetland areas, where it stabilizes soil and quickly creates a favorable microclimate for local flora.
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
- Blue sedgeCarex panicea
- Spring sedgeCarex caryophyllea
- Pendulous sedgeCarex pendula
- Bird's-foot SedgeCarex ornithopoda
- Gray's sedgeCarex grayi
- Strict sedgeCarex stricta
Tips generated and checked by Viridia — adapt them to your local climate.