Helictotrichon pratense
Helictotrichon pratense · Poaceae
The gardener's calendar
Ideal time to plant helictotrichon pratense: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.
ID card
- Common name
- Blue oat grass
- Family
- Poaceae (grasses)
- Foliage
- Evergreen, blue-grey
- Flowering
- June to August, golden spikelets
- Mature size
- 0.80 to 1.20 m tall, 0.40 m wide
- Hardiness
- Very hardy, down to -15 °C
- Growth
- Medium, establishment in 2-3 years
- Origin
- Europe, temperate regions
Care
Sunlight
Install your blue oat grass in full sun to achieve the most beautiful blue-grey foliage colouration. Light shade is tolerated but reduces the intensity of the tones. Avoid overly shaded areas which promote etiolation and weaken the plant.
Soil and drainage
This grass prefers well-drained, poor to average soil, on the dry side. It adapts to chalky and gravelly soils. Avoid heavy, clay or constantly wet soils, which cause rhizome rot.
Watering
Water moderately at planting to encourage rooting, then gradually reduce. Once established, this grass is very tolerant of drought and needs virtually no watering in a temperate climate. Limit watering in winter to avoid stagnant moisture.
Cutting and trimming
Cut back the grass to 10-15 cm tall in late winter or early spring, before new growth begins. Use hedge shears or secateurs to remove dried foliage. Regularly clean out dead leaves from the centre of the clump to improve air circulation.
Fertilising
Blue oat grass thrives in poor soils and needs no fertiliser. Excess nitrogen promotes excessive growth and weakens the structure. A light application of well-rotted compost in autumn is sufficient.
Pests and diseases
This grass is very robust and rarely suffers from diseases. The main risks are rhizome rot in case of excess winter moisture and rust attack in overly humid environments. Ensure optimal drainage to prevent these problems.
Did you know?
Blue oat grass is a grass native to the alpine meadows and grasslands of central Europe. Its intense blue-grey foliage, highly prized in contemporary gardening, makes it a star of modern garden compositions, although it remained little-known to amateur gardeners before the ornamental grass revival in the early twentieth century.
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.
Add this plant to my garden →Plants from the same family
- Tufted hair grassDeschampsia cespitosa
- Wavy hair-grassAvenella flexuosa
- Purple moor-grassMolinia caerulea
- Reed canary-grassPhalaris arundinacea
- Common quaking grassBriza media
- Creeping soft-grassHolcus mollis
Tips generated and checked by Viridia — adapt them to your local climate.