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Couch grass

Elymus repens · Poaceae

The gardener's calendar

The right move for September

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

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ID card

Foliage
Deciduous, blue-green
Flowering
June to August, discrete spikes
Adult size
0.6 to 1.2 m in height
Growth
Fast and invasive
Hardiness
Very hardy, down to -20°C
Origin
Europe, temperate Asia
Soil type
Very tolerant, all soils

Care

Watering

This grass is very tolerant of drought once established. In the first year, water moderately at planting to promote rooting. Thereafter, natural rainfall is sufficient in most temperate regions.

Exposure

Couch grass thrives in full sun or partial shade. It adapts to low-light conditions, although vigor is better in full sun. Avoid areas that are too shaded and constantly humid.

Pruning and cutting

Cut stems to ground level in late winter or early spring to promote dense and neat growth. You can also perform light cutting during the season to maintain a compact shape. Beware: this plant is very invasive; contain it firmly with rhizome barriers if you wish to keep it in check.

Soil and planting

Couch grass tolerates all soil types: clay, sandy, chalky or acidic. It prefers well-drained soil, however. Plant in spring or fall, spacing plants 30 to 50 cm apart to quickly form ground cover.

Fertilization

No fertilizer is necessary; this grass is undemanding. A very moderate application of compost in spring can improve vigor on very poor soils, but remains optional.

Diseases and pests

Couch grass is very vigorous and rarely affected by major diseases or pests. Its deep rhizomes make it virtually indestructible. However, in very wet and permanently waterlogged soils, watch for rhizome rot; improve drainage if necessary.

Did you know?

Couch grass has been known since antiquity as a dreaded "weed": its underground rhizomes can penetrate more than a meter deep and fragment easily, with each piece giving rise to a new plant. Paradoxically, this same tenacity makes it a valuable ally for stabilizing eroded banks, controlling erosion, and creating robust grasslands.

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.