Poaceae
Sea Lyme Grass: Ground Cover Plant
Leymus arenarius
Sea lyme grass is an easy-care, extremely resilient grass. It prefers sunny to partially shaded locations and thrives in sandy, well-drained soils. Once established, it is very drought-tolerant and requires little water. The leaves can be cut back in the fall. Due to its vigorous rhizomatous growth habit, cultivation in a planter or contained beds is recommended.
Every 14 days
Direct sun
-40° - 35°C
% - %
Categories
What is Sea Lyme Grass?
Sea Lyme Grass (Leymus arenarius) is a easy-care plant from the Poaceae family. Sea lyme grass (Leymus arenarius) is a robust, perennial grass from the Poaceae family, native to the coasts of Northern and Western Europe. Its striking blue-gray to steel-blue leaves make it a popular ornamental grass in gardens and landscapes. The plant grows up to 150 cm tall and forms extensive...
Sea Lyme Grass grows up to 1.5m, spread of 200cm, watering every 14 days, -40°C – 35°C. It is not suitable for indoor environments and safe for pets.
Unlike many tropical plants, Sea Lyme Grass tolerates watering mistakes. Best for beginners. Unlike many popular species, Sea Lyme Grass is safe to keep around pets.
How to Care for Sea Lyme Grass?
TLDR: Sea Lyme Grass needs Direct sun, watering every 14 days, and temperatures between -40-35°C with 40-70% humidity.
How Often Should You Water Sea Lyme Grass?
Sea lyme grass is extremely drought-tolerant and only requires occasional watering every 14 days once established. Avoid waterlogging, as the plant prefers well-drained soils. Water regularly during the initial growth phase until the plant is well-rooted.
How Much Light Does Sea Lyme Grass Need?
The ideal location is full sun to partial shade. At least 6 hours of direct sunlight daily promotes vigorous growth and the intense blue-gray coloration of the foliage. The plant does not grow well in full shade.
What Is the Best Soil for Sea Lyme Grass?
Sandy, nutrient-poor, and well-drained soil with a pH value between 5.5 and 8.5 is preferred. However, sea lyme grass also grows in loamy and clayey soils, though it is less aggressive in its spread there. It tolerates saline soils and coastal locations.
What Pot Should You Use for Sea Lyme Grass?
For garden cultivation, a large, deep terracotta or ceramic planter is recommended, as this limits the aggressive spread through rhizomes. Alternatively, a rhizome barrier can be used in the garden bed.
Care Schedule
Fertilize
Every 90 days
What Is Sea Lyme Grass and Where Does It Come From?
Sea lyme grass (Leymus arenarius) is a robust, perennial grass from the Poaceae family, native to the coasts of Northern and Western Europe. Its striking blue-gray to steel-blue leaves make it a popular ornamental grass in gardens and landscapes. The plant grows up to 150 cm tall and forms extensive mats through underground runners (rhizomes), which contribute significantly to sand stabilization and dune development.
How to Propagate Sea Lyme Grass?
Division
Sowing
How Big Does Sea Lyme Grass Grow?
TLDR: Sea Lyme Grass can reach up to 1.5m tall with Fast growth rate.
Max height
1.5m
Spread
2.0m
Growth rate
Fast
Foliage
Semi-evergreen
Plant Uses
Ornamental
Great for decoration
Edible
Can be consumed
Ground Cover
Soil coverage
Culinary Uses
- Seeds can be roasted or ground into flour and used as a bread additive
- Historically, the seeds were harvested as food in Iceland starting from the 12th century
- Young shoots can be processed like cereal grains
Is your plant showing symptoms?
Click on the symptom to discover possible causes:
What Diseases Commonly Affect Sea Lyme Grass?
TLDR: Sea Lyme Grass is susceptible to 6 known diseases. Monitor regularly for early detection.
Rust
Rust is a common fungal disease caused by fungi in the order Pucciniales that affects a wide variety of plants. The disease gets its name from the characteristic orange, yellow, or reddish-brown pustules that appear on leaves, resembling metal rust. This obligate fungal parasite requires living plants to survive and can cause significant economic losses in agricultural crops.
Aphids
Aphids are small, soft-bodied, pear-shaped insects (1/16 to 1/8 inch long) that feed by sucking nutrient-rich sap from plants. They reproduce rapidly and can quickly weaken plants, causing distorted growth and transmitting plant viruses. Aphids come in various colors including green, black, red, yellow, brown, and gray. They secrete honeydew, a sticky substance that attracts ants and encourages sooty mold growth.
Spider Mites
Spider mites are tiny arachnids (less than 1/20 inch long) related to spiders and ticks that feed on plant sap. They thrive in hot, dry conditions and can cause significant damage to ornamental and vegetable plants. During severe infestations, crop losses can reach 14% or higher as these pests disrupt vital plant processes including photosynthesis, carbon dioxide absorption, and transpiration.
Root Rot
Root rot is a serious fungal disease that affects the root system of plants, causing them to decay and die. It is primarily caused by overwatering, poor drainage, or soil-borne fungi such as Pythium, Phytophthora, Rhizoctonia, and Fusarium. The disease thrives in waterlogged conditions where roots are deprived of oxygen, making them susceptible to fungal infection.
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