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Helictotrichon sedenense

Helictotrichon sedenense · Poaceae

The gardener's calendar

The right move for September

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

JFMAMJJASOND Planting

ID card

Common name
Sedene Oat Grass
Family
Poaceae (grasses)
Foliage
Evergreen, blue-grey
Flowering
June to July, golden spikelets
Mature size
60 to 80 cm in height
Growth rate
Slow to moderate
Hardiness
Around -15 °C
Origin
Pyrenees (France, Spain)

Care

Light exposure

Plant this grass in full sun to achieve the best blue-grey coloration of the foliage. A minimum of 6 hours of direct sunlight promotes density and vigor of the clump. Excessive shade causes the plant to become etiolated and less ornamental.

Soil and drainage

Helictotrichon sedenense prefers well-drained soil, even poor or rocky. It tolerates dry and rocky terrain found on mountain slopes. Avoid compact and poorly drained soils that cause root rot in winter.

Watering

Water moderately after planting to establish the root system. Once well-rooted, this mountain grass tolerates drought very well and requires virtually no watering. Excess moisture is more damaging than dryness.

Pruning and tidying

Prune the clump in late winter or early spring (February-March) with secateurs or garden shears, before new growth begins. Remove dry spikes and dead foliage down to 10-15 cm from the ground. Regular combing also helps remove dead parts.

Fertilizer

No fertilizer is necessary. This mountain plant thrives in poor soils and prefers minimal feeding. Excess nitrogen weakens its hardiness and can reduce foliage coloration.

Health and pests

Helictotrichon sedenense is very hardy and seldom susceptible to common diseases. Maintain good drainage to prevent any rot. No special treatment is usually necessary in temperate climates.

Did you know?

Helictotrichon sedenense is a botanical relic of the Pyrenees, once considered a variety of golden oat grass. Its evergreen blue-grey foliage and golden spikelets made it a favorite in alpine and rock gardens since the 19th century, where it was highly sought after by collectors of mountain plants.

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.