Juncus inflexus
Juncus inflexus · Juncaceae
The gardener's calendar
Ideal time to plant juncus inflexus: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.
ID card
- Foliage
- Evergreen, glaucous (blue-grey)
- Flowering
- June to August, inconspicuous flowers in spikelets
- Adult size
- 0.60 to 1.00 m in height
- Growth rate
- Fast
- Hardiness
- Very hardy, down to -20 °C
- Origin
- Europe, western and central Asia
- Soil type
- Moist to very moist, tolerates waterlogging
Care
Watering
Glaucous rush appreciates constantly moist, even wet soils. During the growing season (spring-summer), keep the substrate fresh. When planted in the ground near a pond or marshy area, supplemental watering is usually not necessary. Tolerate temporary flooding without concern.
Light exposure
Install this grass in full sun or partial shade to achieve the best glaucous coloration and vigorous growth. It tolerates partially shaded areas well, but develops a less blue tint. Prefer airy locations to limit fungal problems.
Soil preparation and quality
Glaucous rush thrives in moist, neutral to slightly acidic soils. Enrich with compost or organic matter, but avoid excess chemical fertilizers. It adapts to poor conditions and even tolerates ecological resilience zones or buffer zones around water sources.
Pruning and cutting
Cut back the clump to 5-10 cm from the ground in late winter (February-March), before growth resumes. This pruning rejuvenates the plant and removes dry or degraded parts. You can also perform light cleanup in autumn by removing dead or damaged stems.
Fertilizer and nutrition
Glaucous rush requires little fertilizer in natural conditions. In pots or poor soil, apply a balanced fertilizer once or twice in spring. Avoid excess nitrogen, which reduces the glaucous tint and encourages overly lush, soft growth.
Diseases and problems
This grass is generally very resistant. During prolonged humid weather, watch for rot or leaf fungi: improve air circulation and avoid overcrowding. Pests are rare. No major problems under natural conditions.
Did you know?
Glaucous rush has long been used in basketry and chairmaking (notably in Italy and northern Europe). Its distinctive blue-grey tint is even more pronounced when the plant is grown in slightly shaded areas, which explains why certain regions valued it both for its ornamental appearance and its practical properties.
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
- Snowy WoodrushLuzula nivea
- Great woodrushLuzula sylvatica
- Sharp-flowered rushJuncus articulatus
- Wood rushLuzula multiflora
- Compact rushJuncus conglomeratus
- Toad rushJuncus bufonius
Tips generated and checked by Viridia — adapt them to your local climate.