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Slender rush

Juncus tenuis · Juncaceae

The gardener's calendar

The right move for September

Ideal time to plant slender rush: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.

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ID card

Foliage
Evergreen, fine and filamentous
Flowering
June to August, small greenish flowers
Adult size
30 to 60 cm in height
Growth
Fast
Hardiness
Very hardy, down to -20 °C
Origin
Cosmopolitan, naturalized in Europe
Soil type
Moist, compacted, acidic to neutral
Exposure
Full sun to partial shade

Care

Watering

Slender rush prefers moist environments and tolerates constantly wet soils well. In cultivation, keep the substrate regularly moist, especially during spring growth. Slightly reduce watering in winter, but never let it dry out completely.

Exposure

Install the rush in full sun for optimal growth and good coloration. It tolerates partial shade well, particularly in warm regions where it can help preserve soil moisture. Avoid overly shaded locations, which weaken the plant.

Soil and substrate

Slender rush adapts to poor, compacted and moist soils. A light mix containing peat, potting soil and sand promotes drainage while retaining moisture. It tolerates acidic and neutral soils; dense chalky soils may slow its growth.

Pruning and maintenance

No particular pruning is necessary. You can mow or cut back the clump in late winter before growth resumes to encourage compact growth. Remove dried or damaged parts as the seasons progress.

Fertilizer

Slender rush is an undemanding plant that generally requires no fertilizer. In very poor soils, a light application of balanced fertilizer in spring can stimulate growth. Avoid excess, which can promote overly soft organs.

Diseases and pests

Slender rush is little susceptible to diseases and pests thanks to its hardiness. In excess stagnant humidity or without air circulation, root rot can appear. Ensure adequate drainage and regularly aerate the plant.

Did you know?

Slender rush is a remarkable pioneer plant: capable of colonizing compacted and degraded soils where few other plants survive, it plays an important ecological role in healing disturbed soils, roadsides and degraded wetlands. Its exceptional adaptability to various continents has made it a quasi-cosmopolitan species.

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.