Liriope

Liriope muscari. Family Asparagaceae. Perennial.

Also called Big blue lilyturf, Lilyturf, Border grass, Monkey grass.

Liriope forms dense clumps of arching, grass-like leaves, with upright spikes of small purple flowers in late summer. Gardeners use it to edge paths, cover soil beneath trees and provide dependable foliage in partial shade; despite its appearance, it is not a grass.

Hardiness

USDA zones 5a to 10b

UK hardiness: H5 (hardy, -10 to -15°C)

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Grows outdoors in the shaded zones. Select a zone to see what else grows there.

At a glance

Sun
Partial shade is ideal. Tolerates full shade, with fewer flowers, and full sun where the soil does not become excessively dry.
Water
Water regularly during the first growing season. Established clumps tolerate short dry spells, but grow better with occasional deep watering during prolonged drought.
Soil
Adaptable to clay, loam and sandy soil, provided drainage is adequate. Prefers moderately fertile, slightly acidic to neutral soil; avoid ground that stays waterlogged.
Height
1-1.5 ft (0.3-0.45 m)
Spread
1-2 ft (0.3-0.6 m)
Flowers
Late summer to early autumn; spikes of violet-purple flowers, with white flowers in some cultivars, followed by dark purple-black berries.
Foliage
Evergreen. Arching, strap-shaped, dark green leaves. Variegated cultivars have cream or yellow stripes; foliage may brown or die back in cold winters.
Growth
Moderate; gradually forms broad, dense clumps.
Care needed
Low

Care

  • Water newly planted clumps whenever the upper soil begins to dry, without leaving the roots waterlogged.
  • Apply a thin layer of compost in spring; additional fertiliser is usually unnecessary.
  • Mulch between plants, keeping mulch clear of their crowns.
  • Divide crowded clumps in spring when their centres become sparse or you need more plants.
  • Remove unwanted seedlings and berry-bearing stems where plants are spreading beyond their intended area.

Pruning. In late winter or early spring, remove damaged leaves before new shoots emerge. If the whole clump is winter-battered, cut it back to about 3 in (8 cm), taking care not to clip emerging growth.

Through the year

Late winter
Inspect foliage and remove winter-damaged leaves before fresh growth begins.
Spring
Plant or divide clumps, spacing them 1-1.5 ft (0.3-0.45 m) apart for groundcover.
Mid-spring
Add a thin compost dressing and refresh mulch without burying the crowns.
Summer
Water young plants during dry weather and check shaded clumps for slug damage.
Late summer
Leave flower spikes for display, or remove them after flowering if self-seeding is a concern.
Autumn
Pull unwanted seedlings and check that fallen leaves are not smothering the crowns.

In the garden

  • Edge shaded paths with repeated clumps for a soft but clearly defined border.
  • Plant beneath deciduous trees and shrubs to cover bare soil once the plants establish.
  • Combine with broad-leaved hostas and ferns for contrasting foliage textures.
  • Repeat in simple groups beside paving or courtyard walls for a restrained, architectural effect.
  • Use on lightly shaded banks where dense clumps help cover soil and reduce routine weeding.

Garden styles it suits: Woodland, Japanese, Modern, Traditional, Low-maintenance and Modern courtyard.

Plant it with: Hostas, Japanese painted ferns, Coral bells, Hellebores, Azaleas and Japanese maples.

Wildlife: Bees visit the flowers, and some birds eat the berries. Dense foliage provides shelter for small ground-dwelling animals, but it is not a substitute for locally native woodland plants.

Problems to watch for

  • Crown or root rot in wet ground: improve drainage, keep mulch away from crowns and replace badly rotted plants.
  • Brown leaf spots or anthracnose: remove affected foliage, avoid overhead watering and allow more air movement between clumps.
  • Slugs and snails damaging young leaves: remove hiding places, hand-pick at dusk or use a labelled iron-phosphate bait.
  • Scorched or winter-browned foliage: water during prolonged drought, provide afternoon shade in hot sites and remove damaged leaves before spring growth.

Safety

Not known to be toxic to cats, dogs, horses or people. Leaves, roots and berries are not regarded as poisonous, but the plant is not a food crop and eating substantial amounts may cause stomach upset.

Where it spreads. Can self-seed and become weedy in parts of the southeastern United States. It is generally clump-forming and less aggressive than creeping lilyturf (Liriope spicata); remove seedlings near natural woodland and check local invasive-plant guidance before planting.

Easily confused with

  • Creeping lilyturf (Liriope spicata)

    Spreads strongly through underground runners rather than staying in distinct clumps. Its leaves are usually narrower and its flower spikes less prominent.

  • Mondo grass (Ophiopogon japonicus)

    Usually has finer leaves and small, pale flowers tucked within the foliage, followed by blue berries. Liriope usually holds its purple flower spikes visibly above the leaves.

  • Black mondo grass (Ophiopogon planiscapus 'Nigrescens')

    Has nearly black leaves and pale pinkish-white flowers, unlike the green or striped foliage and usually purple flowers of liriope.

The name

Liriope is named after a nymph in Greek mythology, while muscari refers to the flowers' resemblance to grape hyacinths.

Propagation. Divide established clumps in spring, keeping roots and several growing points on each division. Seed is possible but slower, and seedlings may not retain a named cultivar's foliage or flower characteristics.

Checked against open data

Accepted botanical name
Liriope muscari
In the US and Canada
Introduced in the lower 48 states.
Native range
China North-Central, China South-Central, China Southeast, Japan, Korea, Nansei-shoto and Taiwan.
Measured
Soil pH 5 to 8.

Sources: GBIF (CC BY 4.0), USDA PLANTS and Trefle (CC BY 4.0). The care and design notes are LandscapeGPT's own.

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