Pink muhly grass

Sun

Full sun; tolerates light shade but flowers less freely and may flop.

Water

Water regularly during the first growing season, allowing the soil surface to dry between waterings. Established plants tolerate drought but benefit from occasional deep watering during prolonged dry weather.

Soil

Well-drained sandy, gravelly or loamy soil; tolerates clay if drainage is good. Avoid ground that stays wet in winter.

Height

3-4 ft (0.9-1.2 m), including flower stems

Spread

2-3 ft (0.6-0.9 m)

Flowers

Late summer through autumn; fine pink to rosy-purple flowers in open, mist-like panicles, fading to tan.

Foliage

Narrow, wiry, dark green leaves form a rounded clump. Foliage turns tan in cold weather but may remain partly green in mild winters.

Growth

Moderate; most growth occurs in warm weather.

Care needed

Low

• Plant in spring once the soil is warming, especially near the colder end of its range.
• Water new plants deeply whenever the root zone begins to dry; reduce watering once established.
• Skip routine feeding on ordinary garden soil; excess nitrogen encourages floppy growth.
• Keep mulch away from the crown and prevent winter waterlogging.
• Divide congested clumps in spring when growth resumes; routine annual division is unnecessary.

Pruning. In late winter or early spring, before new shoots lengthen, cut old foliage and flower stems back to 4-6 in (10-15 cm) above the ground. In mild climates, remove dead material without cutting through fresh green growth.

Late winter

Enjoy the remaining seed heads, then cut back before fresh growth starts.

Spring

Plant or divide as the soil warms; water thoroughly after planting.

Late spring

Check new plants for drying roots and keep nearby weeds under control.

Summer

Give established plants a deep watering during prolonged drought; avoid frequent shallow watering.

Autumn

Leave the pink flower heads to fade naturally, or cut a few stems for indoor arrangements.

Winter

Keep the crown free of wet leaf litter and check that water drains away.

• Plant in broad drifts along sunny paths, where the fine flower heads soften hard edges.
• Position where low autumn sunlight shines through the pink flowers.
• Combine with coneflowers, black-eyed Susans and upright sedums for a late-season perennial border.
• Use repeated clumps among boulders and gravel for a light contrast to solid forms.
• Plant in sunny coastal gardens with freely draining soil.

Garden styles it suits: New perennial (prairie), Native meadow, Dry gravel garden, Coastal, Autumn colour and Low-maintenance.

Plant it with: Purple coneflower, Black-eyed Susan, Butterfly weed, Autumn stonecrop, Little bluestem and Russian sage.

Wildlife: Dense clumps provide shelter for insects and other small animals, and seed-eating birds may take the seeds. The flowers are wind-pollinated rather than a nectar source for bees.

• Crown or root rot in waterlogged soil: improve drainage or move the plant to a raised, freely draining position.
• Sparse flowering in shade or cool summers: choose the sunniest, warmest available site; cool-climate flowering may still be unreliable.
• Flopping growth from shade or rich feeding: increase sun exposure and stop nitrogen-rich fertiliser.
• Winter losses at the cold end of its range: plant in spring, avoid exposed wet sites and keep the crown well drained.

Not known to be toxic to cats, dogs, horses or people. No part is recognised as poisonous, although eating large amounts of any ornamental grass may cause digestive upset.

• Ruby grass (Melinis nerviglumis)

  Ruby grass has more compact, visibly fluffy pink flower clusters and broader, often blue-green leaves; pink muhly has much finer, widely branching flower heads.

• Purple fountain grass (Cenchrus setaceus 'Rubrum')

  Purple fountain grass has burgundy foliage and thick, arching bottlebrush flower heads, rather than green, wiry leaves and an open pink haze.

Muhlenbergia honours the American botanist Gotthilf Heinrich Ernst Muhlenberg, and capillaris means hair-like, referring to the fine flowering branches.

Propagation. Divide established clumps in spring as new growth begins. Alternatively, surface-sow seed in spring, press it into the growing medium and keep it lightly moist; seed-grown plants may vary in flower colour and timing.

Accepted botanical name

Muhlenbergia capillaris

In the US and Canada

Native in the lower 48 states and Puerto Rico.

Native range

Alabama, Arkansas, Bahamas, Connecticut, Cuba, Delaware, District of Columbia, Florida, Georgia, Guatemala, Illinois and Indiana.

Measured

Soil pH 5.8 to 6.8.

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