Blue Wile Rye Leymus arenarius

Lyme grass is an ornamental herbaceous perennial in the grass family (Poaceae) native to the coastal areas of Europe. It is a fast-growing, semi-evergreen, cool-season grass with flat, steel-blue foliage that has an attractive arching, irregular to narrow upright habit growing to 2 to 3 feet tall and wide.

Plant in the full sun to partial shade in moist but well-drained soil. It prefers sandy soils but withstands a variety of soil types, moisture levels, and pHs. It can be weedy and aggressive, as it spreads by rhizomes. It is less aggressive in dry clay soils. Cut back the leaves in the fall and divide clumps in mid-spring to early fall.  

The cut leaves are terrific for flower arranging. This grass is highly drought- and salt-tolerant as well as resistant to browsing by deer and rabbits. Plant it in a location that takes into account its aggressive tendencies. It makes an effective ground cover for erosion-prone areas. But it is best grown in a container to prevent further spread.

Insects, Diseases, and Other Plant Problems:  Aphids and spider mites are occasional insect problems. It can grow and spread aggressively. Around Lake Michigan, it threatens native dune plants and is listed as invasive in WI. Alternatives should be considered.