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Thinopyrum junceum

Thinopyrum junceum · Poaceae

The gardener's calendar

The right move for September

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

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ID card

Family
Poaceae (grasses)
Foliage
Deciduous, fine and blue-tinted
Flowering
June to August, discrete spikes
Adult size
0.5 to 0.8 m in height
Hardiness
Very hardy (down to -20°C)
Growth
Fast and vigorous
Origin
Coastlines and dunes of Northern Europe
Soil type
Sandy, well-draining, salt-tolerant

Care

Exposure

Plant marram grass in full sun for optimal growth. This grass also tolerates partial shade, but prefers well-lit locations. It handles windy and coastal exposures exceptionally well.

Watering

Once established, marram grass requires almost no watering: it draws most of its water from deep soil through its root system. During planting, water regularly for the first 4 to 6 weeks to promote root establishment.

Soil

Choose light, sandy, well-draining soil. This species is highly tolerant of salinity and poor soils, making it ideal for coastal gardens or difficult terrain. Avoid heavy, compacted soils that can suffocate roots.

Pruning and maintenance

Cut back the clump to ground level in early spring (February-March) to encourage vigorous new growth. This annual pruning removes winter-dried foliage and rejuvenates the plant. You can also gently comb the clump by hand to remove spikes and debris.

Fertilizing

Marram grass requires minimal fertilizer. A balanced fertilizer application in spring is sufficient if the soil is very poor. Generally, this hardy grass thrives on the natural organic matter in the soil.

Pests and diseases

This robust grass is practically unaffected by major pests or diseases. Prolonged excess moisture can promote lawn blight, but this is rare on well-draining soil. No specific problems should be expected under normal growing conditions.

Did you know?

Marram grass is an iconic pioneer plant of European coastal dunes. Its highly developed root system penetrates deep into the sand to access water, playing a crucial ecological role in stabilizing dunes and protecting them from wind erosion. Once used extensively to fix dunes threatened by sea encroachment, it remains a valuable ally for restoring coastal ecosystems.

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.