Lyme grass
Leymus arenarius · Poaceae
The gardener's calendar
Ideal time to plant lyme grass: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.
ID card
- Foliage
- Deciduous, blue-grey
- Flowering
- Summer (June to August)
- Adult size
- 60 to 120 cm tall
- Growth
- Fast
- Hardiness
- Very hardy (down to -25°C)
- Origin
- Sandy coasts of Northern Europe and Atlantic
- Soil type
- Sandy, well-draining, poor
Care
Sunlight
Sand couch grass loves full sun and even tolerates direct coastal exposure with salt spray. It accepts partial shade but develops better in abundant light. Avoid overly shaded areas that would slow its growth.
Soil
This ornamental grass is made for sandy, poor and very well-draining soils. It hates standing water and thrives perfectly in salty coastal substrates. No amendment is necessary; it even prospers on poor soil where few plants grow.
Watering
Once established (after 2-3 months), sand couch grass is very drought-resistant. Water moderately during the first year to encourage rooting. In normal weather, natural rainfall is more than sufficient.
Pruning and cutting
Cut back or trim the plant to ground level in late February or early March, before the growing season resumes. This grass regenerates easily and regrows vigorously. You can also leave it natural for a wilder look.
Fertilizer
No fertilizer input is necessary. Since sand couch grass grows on poor soils, fertilizing could promote excessive growth and destabilize the plant. Let it make do with what it finds.
Diseases and pests
Very robust, sand couch grass rarely suffers from diseases or pests. Only persistent excess moisture could cause root rot. Ensure optimal drainage and keep it away from flood-prone areas.
Did you know?
Sand couch grass is a true hero of Atlantic coasts: its deep and spreading roots stabilize dunes against storms, making it a valuable ally for coastal preservation. This grass was once traditionally planted by coastal farmers to fix sand and protect inland crops.
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.