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Perennial ryegrass

Lolium perenne · Poaceae

The gardener's calendar

The right move for September

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

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ID card

Foliage
Persistent, semi-persistent depending on climate
Flowering
Spring to early summer (May-July)
Adult size
20 to 40 cm in height
Growth
Very fast
Hardiness
Very hardy, down to -15°C
Origin
Temperate and western Europe
Soil type
Well-drained, fertile, neutral to slightly acidic pH

Care

Watering

Perennial ryegrass loves regular moisture, especially during establishment and active growth periods. Water in a way that keeps the soil moist but not waterlogged. In mature lawns, natural rainfall is generally sufficient, except during prolonged drought.

Exposure

This grass prefers full sun for optimal growth, but also tolerates light shade. A minimum of 4 to 5 hours of direct sunlight per day ensures good density. It develops poorly in dense shade.

Mowing and cutting

Mow regularly between 2.5 and 4 cm in height depending on use (ornamental or wear-resistant lawn). Maintain frequent and light mowings rather than close cuts. The grass can be mowed from spring through autumn in mild climates.

Soil and preparation

Perennial ryegrass thrives in fertile, well-structured and well-drained soil. Adding organic matter improves water retention in sandy soils. Avoid compacted ground; annual aeration strengthens vitality and root penetration.

Fertilization

Apply balanced fertilizer in spring and early autumn to support growth. Choose nitrogen-rich formulas to green and thicken the lawn. Avoid excess applications that encourage disease and weakness.

Diseases and pests

Perennial ryegrass is susceptible to fungal diseases in overly damp or poorly aerated conditions, such as snow mold or fusariosis. Good drainage and adequate air circulation limit these risks. Regular monitoring and annual aeration are preventive measures.

Did you know?

Perennial ryegrass is one of the most widely used grasses in Europe for sports fields and golf courses, both for its rapid establishment and its resistance to trampling. It revolutionized pasture improvement in the nineteenth century by allowing superior yields for livestock. Its English name "perennial ryegrass" reflects its perennial nature unlike other annual lolium 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.