Mountain muhly

Sun

Full sun; light shade is tolerated, but flowering and upright growth are usually better in sun.

Water

Low once established. Water during establishment and occasionally during prolonged drought; avoid persistently damp soil.

Soil

Well-drained sandy, gravelly or rocky soil of low to moderate fertility. Avoid heavy, waterlogged ground, especially in winter.

Height

1-2.5 ft (0.3-0.75 m), including flower stems

Spread

1-2 ft (0.3-0.6 m)

Flowers

Summer to early autumn; loose, fine-textured panicles with purplish or bronze tones, fading to tan.

Foliage

Narrow, often rolled green to grey-green leaves form a dense basal tuft and turn straw-gold as they age.

Growth

Moderate during warm weather

Care needed

Low

• Deer resistant
• Drought tolerant
• Cold hardy
• Wildlife

Northern hemisphere months. In Australia, shift them by six.

Difficulty

Easy

Toughness

Very tough

Pick your zone, country, light and whether you have pets.

1. Planting day

   1.1 ft (0.35 m)

2. After 1 year

   1.4 ft (0.42 m)

3. After 2 years

   1.6 ft (0.49 m)

4. After 3 years

   1.7 ft (0.53 m)

   full size

About 3 years to full size.

From a typical nursery size, at an average rate for this kind of plant. A rule of thumb, not a forecast.

Cats and dogs

Safe

Native to

the US

Growth rate

Moderate

• Water newly planted clumps when the root zone begins to dry; reduce watering once established.
• Keep the crown at soil level and provide drainage that prevents winter saturation.
• Skip routine feeding; rich soil and excess nitrogen can produce loose, floppy growth.
• Use a light gravel mulch rather than piling organic mulch against the crown.
• Divide crowded or declining clumps in spring as fresh growth begins.

Pruning. In late winter or early spring, cut the old leaves and flower stems to about 3-4 in (8-10 cm) above the ground before new growth develops. Leave the dry stems standing through winter if they remain upright.

Late winter

Enjoy standing seed heads, then remove old growth before fresh shoots emerge.

Spring

Plant or divide once the soil is workable and warming; water new clumps thoroughly.

Late spring

Weed around the clumps and check that mulch is clear of their crowns.

Summer

Water establishing plants during dry spells; give established plants water only during prolonged drought.

Autumn

Leave golden foliage and seed heads for seasonal structure, or collect ripe seed for propagation.

Winter

Check that runoff is not collecting around the crowns, particularly in heavy soil.

• Plant small groups among rocks or gravel for fine texture without hiding the stone.
• Combine with blue grama and drought-tolerant wildflowers in a short, open meadow planting.
• Repeat along a sunny path or border edge to create a low, informal rhythm.
• Place where low autumn sunlight can shine through the flower heads.

Garden styles it suits: Mountain lodge, Desert / xeriscape, Dry gravel garden, Native meadow, New perennial (prairie) and Low-maintenance.

Plant it with: Blue grama, Prairie coneflower, Blanketflower, Pineleaf penstemon and Fringed sagebrush.

Wildlife: Seeds provide food for small birds, and the tufts offer shelter for insects. Like other grasses, it is wind-pollinated rather than a significant nectar source.

• Crown or root rot in wet soil: improve drainage or move the plant to raised, gravelly ground; avoid winter irrigation.
• Floppy growth in shade or rich soil: provide more sun and stop fertilising.
• Poor flowering in cool, damp summers: choose a warmer, sunnier position; flowering may remain sparse in unsuitable climates.
• Dead centres in older clumps: lift and divide in spring, retaining healthy outer sections.

Mountain muhly is not known to be toxic to people, cats, dogs or horses. No part is recognised as poisonous, although species-specific toxicity information is limited.

• Pink muhly grass (Muhlenbergia capillaris)

  Usually forms larger clumps with a conspicuous cloud of pink flowers in autumn; mountain muhly has smaller, more subdued bronze-purple flower heads.

• Deer grass (Muhlenbergia rigens)

  Forms a much larger, coarser mound with long, narrow, spike-like flower heads rather than mountain muhly's small, open panicles.

Muhlenbergia honours the American botanist Gotthilf Heinrich Ernst Muhlenberg, while montana means 'of mountains', referring to its upland habitat.

Propagation. Sow ripe seed shallowly in a free-draining seed mix in spring, keeping it lightly moist until established. Divide mature clumps in spring as active growth begins.

Accepted botanical name

Muhlenbergia montana

In the US and Canada

Native in the lower 48 states.

Native range

Arizona, California, Colorado, Mexico Central, Mexico Northeast, Mexico Northwest, Mexico Southeast, Mexico Southwest, Montana, New Mexico, Texas and Utah.

Measured

Soil pH 6.5 to 7.5. Average height 38 cm.

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