Indian Grass

Thrives in USDA Zones 4 - 9

• Transplant

  Plant in spring after last frost or in early autumn. Space 2-3 feet; Indian Grass is clump-forming and spreads slowly. Stake young plants in windy sites until established.

• Harvest

  Leave standing through winter for birds and structure; cut back to 4-6 inches in late winter before new growth emerges.

• Indian Grass naturalises slowly from self-seeding; allow seedlings to establish in drifts for the most naturalistic effect.

• The yellow anthers on the seed heads are the most distinctive identification feature; they contrast beautifully with the bronze seed head and make Indian Grass easy to spot in autumn prairie plantings.

• Plant in a triangle or informal drift with Big Bluestem and Switchgrass to recreate the dominant grass species of the original tallgrass prairie.

• Watering

  If dry weather lingers, let the top 2 inches start to dry before watering again. This plant often responds better to an occasional deep soak than to frequent light watering.

• Feeding

  Extra feeding is rarely required if soil is healthy. If growth looks pale or slow, a light compost top-dressing is often enough before adding anything stronger.

• Seasonal care

  In late fall, a light cleanup and fresh mulch can help if winter protection is useful in your climate. Leaving a little space around crowns and trunks often helps air move and keeps excess moisture from sitting there.

• Harvest timing

  Harvests often cluster around January, October, November, December. If fruit, leaves, or roots start looking ready, color, size, firmness, and scent usually tell you more than the calendar alone.

• Sioux Blue

  The most widely available cultivar; pronounced blue-gray summer foliage that is more intense than the straight species; excellent fall color. A standout for summer foliage contrast.

  Best for

  Blue summer foliage; ornamental borders

• Rumsey

  Compact cultivar at 3-4 feet (shorter than most Indian Grass); better suited to smaller gardens while retaining the characteristic seed head beauty.

  Best for

  Smaller gardens; front of border

• Straight species (local provenance)

  Seed-grown from regional sources for prairie restoration and ecological gardens; genetic diversity supports the fullest range of wildlife associations.

  Best for

  Prairie restoration; ecological gardens

• Rust (minor)
• Aphids (minor)

Origin

Native to central and eastern North America, from southern Canada through the Great Plains and eastward to the Atlantic states, and south through the southeastern US.

Native Habitat

Tallgrass and mixed-grass prairies, open woodlands and savannas; tolerates a wider range of soil moisture than little bluestem.

Current Distribution

Common in remnant prairies; widely cultivated in native plant and ornamental gardens; increasingly used in designed prairie restorations and naturalistic landscapes.

Kingdom

Plantae

Family

Grass family (Poaceae)

Genus

Sorghastrum

Species

Sorghastrum nutans

• Root System

  Deep fibrous root system to 6 feet; clump-forming without spreading rhizomes; excellent soil stabiliser.

• Stem

  Upright culms 4-6 feet tall; blue-green in summer, aging to orange-tan in autumn.

• Leaves

  Flat blades 1/4 - 1/2 inch wide, blue-green in summer; orange-tan fall color; hairy leaf sheaths are a good identification character.

• Flowers

  Compact, bronze-gold spike-like panicle; distinctive for its bright yellow anthers that contrast with the copper-bronze glumes - the most ornamentally striking seed head of the common prairie grasses.

• Fruit

  Small grain with a twisted awn; wind-dispersed; seed heads remain attractive well into winter.

Sorghastrum nutans is one of the three dominant grasses of the tallgrass prairie, co-occurring with Big Bluestem and Switchgrass across the 170-million-acre grassland system that once covered the central United States. It is a C4 warm-season grass with deep roots (up to 6 feet) that contributed substantially to the formation of the deep, carbon-rich mollisol soils of the Great Plains. The species is named nutans (nodding) for the way its seed heads bow slightly in wind. Along with Big Bluestem, it was the primary grass grazed by the estimated 30-60 million bison that inhabited the Great Plains before European settlement. Indian Grass was used by multiple Indigenous peoples for thatching, basketry, and as a site indicator for well-drained, fertile soils suitable for agriculture. The loss of the tallgrass prairie system - more than 96% has been converted to agriculture - makes remnant populations of Indian Grass and its associated species among the most endangered native plant communities in North America.