Deer grass

Sun

Full sun; tolerates light shade, but flowers less freely and may grow more loosely.

Water

Water regularly during the first growing season. Once established, water deeply but infrequently during prolonged dry weather; avoid constantly wet soil.

Soil

Well-drained sandy, gravelly or loamy soil; tolerates clay if drainage is adequate. Avoid waterlogged ground, especially in winter.

Height

3-4 ft (0.9-1.2 m) in leaf; 4-5 ft (1.2-1.5 m) in flower

Spread

4-5 ft (1.2-1.5 m)

Flowers

Late summer to autumn; narrow, upright spikes of tiny tan to purplish flowers fade to straw-coloured seedheads.

Foliage

Long, narrow green to grey-green leaves form a dense, arching mound. Evergreen in mild climates; foliage may brown in cold winters.

Growth

Moderate to fast in warm weather

Care needed

Low

• Deer resistant
• Drought tolerant
• Heat tolerant
• Wildlife

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

Difficulty

Moderate

Toughness

Fairly tough

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

1. Planting day

   1.1 ft (0.35 m)

2. After 1 year

   2.3 ft (0.7 m)

3. After 2 years

   3 ft (1.1 m)

   full size

About 2 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

Fast

• Space plants about 4-5 ft (1.2-1.5 m) apart so mature clumps do not crowd one another.
• Water deeply during establishment, allowing the soil surface to dry between waterings.
• Established plants need little supplementary water, though occasional deep watering keeps foliage greener in prolonged drought.
• Do not routinely fertilise; rich feeding encourages excessive, floppy growth.
• Keep mulch clear of the crown and divide only when clumps become too large or develop a dead centre.

Pruning. In late winter or early spring, remove old flower stems and comb or rake out loose dead foliage. If the whole clump is shabby, cut it back to 6-12 in (15-30 cm) before new growth begins; annual shearing is usually unnecessary.

Late winter

Remove old flower stems and dead foliage; cut back only if the clump needs renewal.

Spring

Plant once the soil begins to warm, and water deeply to settle the roots.

Late spring

Divide overcrowded clumps as active growth starts, and keep divisions watered until rooted.

Summer

Water young plants deeply; give established clumps water only during prolonged dry spells.

Autumn

Leave flower spikes standing for texture and seed-eating birds.

Winter

Check that water drains away from the crown, particularly in cool, rainy climates.

• Plant repeated groups in a sunny gravel garden for a consistent rhythm of rounded foliage and upright stems.
• Use as a specimen beside paving or boulders, leaving enough space for leaves to arch clear of paths.
• Combine with salvias, buckwheats and other dry-garden perennials for contrasting flower shapes and textures.
• Mass on sunny banks or in broad naturalistic borders for movement and winter structure.

Garden styles it suits: California native, Southwestern, Desert / xeriscape, Dry gravel garden, Architectural minimal and Low-maintenance.

Plant it with: Cleveland sage, California buckwheat, Red yucca, Desert marigold, Yarrow and California fuchsia.

Wildlife: Dense clumps provide cover for small wildlife, and seed-eating birds may visit the seedheads. Like other grasses, it is wind-pollinated rather than a nectar source.

• Crown or root rot in waterlogged soil: improve drainage or move the plant to a raised, freely draining site.
• Sparse flowering or floppy growth in shade: move to full sun and avoid high-nitrogen fertiliser.
• A dead centre in an old clump: divide in spring, discard the dead portion and replant healthy outer sections.
• Winter-browned foliage: leave it through severe cold, then remove damaged growth before spring shoots develop.

Not known to be toxic to cats, dogs, horses or people; no parts are recognised as poisonous. The narrow leaf edges can scratch skin, so wear gloves when handling large clumps.

• Pine muhly (Muhlenbergia dubia)

  Usually forms a smaller, narrower clump with finer, more wiry foliage; deer grass makes a broader, heavier mound.

• Lindheimer's muhly (Muhlenbergia lindheimeri)

  Usually has distinctly blue-grey foliage and more open, branched flower panicles; deer grass is generally greener with narrow, spike-like flower heads.

• Pink muhly grass (Muhlenbergia capillaris)

  Produces an airy cloud of pink flowers rather than the tall, narrow, tan flower spikes of deer grass.

Muhlenbergia honours the American botanist Gotthilf Heinrich Ernst Muhlenberg, and rigens means stiff or rigid, referring to the plant's stiff growth.

Propagation. Divide healthy clumps in spring as growth resumes, using a sharp spade or saw and retaining roots on each division. It can also be raised from seed sown in spring with warmth and light moisture.

Accepted botanical name

Muhlenbergia rigens

In the US and Canada

Native in the lower 48 states.

Native range

Arizona, California, Mexico Northeast, Mexico Northwest, Mexico Southwest, Nevada, New Mexico and Texas.

Measured

Soil pH 5.5 to 7.5. Average height 33 cm.

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