Seep muhly

Sun

Full sun; light shade is tolerated but usually reduces flowering.

Water

Moderate while establishing; low once established. Tolerates drought and occasional wet spells, but not prolonged waterlogging.

Soil

Well-drained sandy, loamy, rocky or clay soil; particularly suited to neutral or alkaline soils, including limestone ground.

Height

2-3 ft (0.6-0.9 m), including flowers

Spread

2-3 ft (0.6-0.9 m)

Flowers

Late summer to autumn; fine, airy pink to pinkish-purple flower heads, fading to tan.

Foliage

Narrow, arching green leaves form a dense, fine-textured mound. Leaves turn straw-coloured in cold weather and may remain partly green in mild winters.

Growth

Moderate

Care needed

Low

• Deer resistant
• Drought tolerant
• Heat tolerant
• 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

   1.7 ft (0.51 m)

3. After 2 years

   2.2 ft (0.67 m)

4. After 3 years

   2.5 ft (0.75 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 deeply during dry spells in the first growing season; established plants usually need water only during prolonged drought.
• Avoid rich feeding; on very poor soil, apply a light dressing of compost in spring.
• Keep the crown at soil level and keep mulch clear of its centre.
• Leave enough space for the arching mound to develop without crowding neighbouring plants.
• Divide in spring when growth resumes if the centre dies out or the clump becomes too large.

Pruning. Leave the dry foliage and flower stems standing through winter. In late winter or early spring, before new shoots lengthen, cut the old growth back to 3-6 in (8-15 cm).

Late winter

Enjoy the standing seed heads, then cut back old growth before fresh shoots emerge.

Spring

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

Early summer

Water establishing clumps during dry weather and remove weeds around their bases.

Late summer

Leave developing flower stems intact; avoid nitrogen-rich fertiliser.

Autumn

Leave fading flowers for winter structure, or collect ripe seed when it releases easily.

Winter

Check that water is not collecting around the crown, particularly in heavy soil.

• Plant in repeated groups through a sunny perennial border for a soft, transparent layer among stronger flower shapes.
• Mass beside a path or terrace where low sunlight can shine through the autumn flowers.
• Combine with drought-tolerant perennials in gravel gardens and limestone planting beds.
• Use in prairie-style planting with coneflowers, asters and other clumping grasses.

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

Plant it with: Purple coneflower, Aromatic aster, Butterfly weed, Little bluestem, Autumn sage and Prairie dropseed.

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

• Crown or root rot in persistently wet 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.
• Floppy growth in rich soil: stop high-nitrogen feeding and avoid unnecessary watering.
• A thinning or dead centre in an older clump: divide in spring and replant healthy outer sections.

Not known to be toxic to people, cats, dogs or horses; no part is recognised as poisonous. Ornamental planting is not a substitute for suitable forage, and pets may vomit after eating grass.

• Pink muhly grass (Muhlenbergia capillaris)

  Usually has larger, denser and more vividly pink flower clouds. Seep muhly generally has finer leaves and a looser, more delicate flowering display; the two can be difficult to distinguish outside flowering.

• Lindheimer's muhly (Muhlenbergia lindheimeri)

  Forms a much taller, coarser clump with blue-grey leaves and upright, narrow, pale flower plumes rather than a low mound topped by a pink haze.

Muhlenbergia honours botanist Gotthilf Heinrich Ernst Muhlenberg, reverchonii honours botanist Julien Reverchon, and 'seep' refers to the seasonally moist places where this grass often grows.

Propagation. Divide established clumps in spring as new growth starts. Sow seed in spring in a warm, bright position, pressing it onto the surface and keeping it lightly moist; named selections should be divided to preserve their characteristics.

Accepted botanical name

Muhlenbergia reverchonii

In the US and Canada

Native in the lower 48 states.

Native range

Mexico Central, Mexico Northeast, Oklahoma and Texas.

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