Giant sacaton

Sun

Full sun; flowering and upright growth are best in an open, warm position.

Water

Drought-tolerant once established. Water regularly during its first growing season, then deeply during prolonged dry spells if foliage begins to curl or brown.

Soil

Adaptable to sandy, loamy or clay soils, including alkaline and moderately saline ground. Tolerates periodic flooding, but avoid persistently waterlogged soil, particularly in winter.

Height

6-8 ft (1.8-2.4 m), including flower stems

Spread

3-5 ft (0.9-1.5 m)

Flowers

Late summer to autumn; large, airy flowerheads with pinkish-purple tones, fading to pale tan.

Foliage

Long, narrow, arching grey-green leaves form a substantial clump and turn straw-coloured in autumn. Some foliage may remain green in frost-free conditions.

Growth

Moderate to fast in warm weather; slower in cool-summer climates.

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

   3 ft (1.1 m)

3. After 2 years

   6 ft (1.8 m)

4. After 3 years

   7 ft (2.1 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

Growth rate

Moderate

• Water deeply through the first growing season, allowing the soil surface to dry between waterings.
• Leave 3-5 ft (0.9-1.5 m) between plants so mature clumps have room to expand.
• Avoid routine feeding; rich soil and heavy nitrogen applications can encourage floppy growth.
• Keep mulch away from the crown, especially where winters are wet.
• Divide in spring only when a clump becomes too large or develops a dead centre.

Pruning. Leave the dry stems standing through winter, then cut the whole clump to 6-12 in (15-30 cm) above ground in late winter or early spring, before new shoots lengthen. Wear gloves and long sleeves when handling the coarse leaves.

Late winter

Cut back old leaves and flower stems before new growth begins.

Spring

Plant or divide once the soil is warming; do not mistake its late emergence for winter damage.

Late spring

Check new plantings for moisture and remove weeds around the developing clumps.

Summer

Water young plants deeply during dry weather; established clumps usually need little supplementary water.

Autumn

Leave the ripening seedheads and dry foliage for wildlife and winter structure.

• Use as a tall focal point in a sunny gravel garden, with lower drought-tolerant plants around its base.
• Plant in broad groups at the back of a large border for a light, moving screen.
• Combine with late-flowering perennials so their flowers show through its airy seedheads.
• Use beside paths or terraces where there is enough setback for its wide, arching leaves.

Garden styles it suits: Southwestern, Desert / xeriscape, New perennial (prairie), Architectural minimal, Dry gravel garden and Winter interest.

Plant it with: Red yucca, Autumn sage, Purple coneflower, Gaura, Little bluestem and Threadleaf coreopsis.

Wildlife: Seedheads provide food for seed-eating birds, and the dense clumps offer shelter for insects and small animals. Flowers are wind-pollinated rather than a nectar source for bees.

• Crown rot in persistently wet winter soil: improve drainage or move the plant to a raised position.
• Floppy stems in shade or overly rich soil: provide full sun and stop nitrogen feeding.
• Poor growth or sparse flowering in cool summers: choose the warmest sunny position available; flowering may remain limited in cool maritime gardens.
• Dead centre in an old clump: divide in spring and replant vigorous outer sections.

Not known to be toxic to people, cats, dogs or horses. No part is recognised as poisonous; coarse leaves can scratch skin, so wear gloves when cutting or dividing.

• Alkali sacaton (Sporobolus airoides)

  Usually smaller, commonly 2-4 ft (0.6-1.2 m) tall, with a finer, less imposing clump and airy pinkish flowerheads.

• Prairie dropseed (Sporobolus heterolepis)

  Forms much smaller, finely textured mounds, usually reaching only 2-3 ft (0.6-0.9 m) in flower; its flowers often have a distinctive scent.

• Pampas grass (Cortaderia selloana)

  Has dense, fluffy white or pink plumes rather than giant sacaton's open, finely branched flowerheads, and much sharper leaf edges.

Sporobolus means 'seed thrower', referring to the release of ripe seeds, and wrightii honours the American botanical collector Charles Wright.

Propagation. Sow seed in spring with warmth, covering it only lightly, or divide established clumps in spring as growth starts. Large clumps are tough to split, so use a sharp spade and replant divisions promptly.

Accepted botanical name

Sporobolus wrightii

Native range

Arizona, California, Mexico Central, Mexico Northeast, Mexico Northwest, New Mexico, Oklahoma, South Carolina, Texas and Utah.

Measured

Soil pH 5.6 to 8.

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