Ophiopogon jaburan aka Lilyturf

Ophiopogon jaburan is an evergreen perennial in the asparagus family, Asparagaceae. Its common names include giant mondo grass and blue snake's beard. It comes from Korea, including Jeju, and parts of Japan. Its Japanese range includes west-central and southern areas and the Nansei Islands. This plant grows in temperate regions. Despite its grass-like look, it belongs to a different family.

The plant forms leafy tufts that build into rounded clumps. In gardens, it reaches about 1.6–3.3 feet [0.5–1 metre] tall and wide. It takes about two to five years to reach full size. The green leaves can reach 2 feet [0.6 metres] long. Some plants have variegated leaves. The foliage stays green through the year, giving beds a lasting leafy cover. Its mounded shape suits both single plants and groups.

Upright flower stems rise to about 2 feet [0.6 metres]. They carry clusters of small flowers, each shaped like a bell. Most flowers are white, though some have a lilac tint. The RHS places flowering in summer. Chicago Botanic Garden gives a broader season, from May through August. Bluish-purple berries follow the flowers. The flowers and fruit add seasonal detail to the leafy clumps.

Light shade and rich soil suit this plant best. Keep the soil moist, but allow excess water to drain. Slightly acid soil is preferred, though neutral soil also suits it. It tolerates clay, loam, and sand. The RHS lists sun, partial shade, and full shade as possible positions. Chicago Botanic Garden lists partial to full shade and moderate water needs. The RHS rates it H3, for mild or coastal UK areas. Plants may need winter protection in colder places. Chicago Botanic Garden lists USDA zones 9–12.

Use it as ground cover, along bed edges, or beneath shrubs. It also suits borders, containers, rock gardens, banks, and slopes. Its clump shape can serve as a single focal plant. The RHS lists it for coastal, courtyard, and informal gardens. No routine pruning is needed. Remove dead leaves in spring with a rake or comb. Divide clumps in spring when new growth starts. Sow seed as soon as it ripens. Slugs may damage the plant, but diseases are rarely a problem.