Pennisetum orientale

oriental fountain grass

Poaceae

Central Asia, the Caucasus region, and northwestern India

Deer Resistant Drought Tolerant Container Friendly

SunFull Sun

WaterLow · drought-tolerant

HardinessZones 6–9

Overview

Pennisetum orientale is a deciduous clump-forming ornamental grass reaching 18–30 inches (45–75 cm) tall and 18–24 inches (45–60 cm) wide, with a compact mounding-to-fountain-shaped habit. The species carries narrow gray-green to blue-green leaf blades 0.1–0.25 inch (3–6 mm) wide and 10–18 inches (25–45 cm) long, producing a narrower leaf texture than P. alopecuroides at 0.25–0.4 inch (6–10 mm) wide. Flower spikes are soft fluffy cylindrical bottlebrush shapes 2–4 inches (5–10 cm) long, pinkish-mauve with conspicuous long bristles, carried on arching stems above the foliage from June through September over a 10–14 week window. Spikes age from fresh pinkish-mauve to tan across the bloom period and hold structure into autumn. Autumn foliage turns golden-yellow in October. Growth rate is moderate; the clump reaches full mature size in 2 growing seasons. The species handles drier conditions and alkaline soils better than P. alopecuroides, which suits it to gravel gardens and low-water Mediterranean-climate plantings. Hardy to USDA zone 6 (to –10°F / –23°C), which is 1 zone warmer than P. alopecuroides at zone 5. Not known to be toxic to pets or humans.

Native Range

Pennisetum orientale is native to central Asia, the Caucasus region, and northwestern India, occurring on rocky slopes, dry meadows, and open scrub at 3,000–8,000 feet (900–2,400 m) elevation.

Suggested Uses

Used in perennial borders, gravel gardens, Mediterranean-climate plantings, low-water xeriscape positions, and containers at 18–24 inch (45–60 cm) spacing. The 10–14 week June-to-September bloom window runs 4–8 weeks longer than the August-to-September bloom of P. alopecuroides 'Hameln' and 2 months earlier, giving the species a use case in plantings where summer flowering from grasses is wanted. Drought and alkaline soil tolerance fits the species to positions that fail for most ornamental grasses. Compared with P. alopecuroides 'Hameln', the species sits 1 zone warmer (USDA 6 versus 5), so colder-climate gardens should choose 'Hameln' or the cultivar 'Karley Rose' at zone 5. The plant does not grow well in shade, wet soils, or climates below USDA zone 6.

How to Identify

Clump is compact mounding to fountain-shaped at 18–30 inches (45–75 cm) tall and 18–24 inches (45–60 cm) wide. Leaves are gray-green to blue-green, narrow, 0.1–0.25 inch (3–6 mm) wide and 10–18 inches (25–45 cm) long, arching. Flower spikes are soft fluffy cylindrical bottlebrush 2–4 inches (5–10 cm) long, pinkish-mauve with long bristles, June–September. Compared with P. alopecuroides 'Hameln', leaves are 0.1–0.2 inch (3–5 mm) narrower, foliage carries a gray-green to blue-green tint rather than plain medium green, flower spikes measure 2–4 inches (5–10 cm) shorter with a softer fluffier texture, bloom opens 2 months earlier (June versus August), and the bloom window runs 4–8 weeks longer; compared with P. orientale 'Karley Rose', flower spikes measure 3–5 inches (8–12 cm) shorter, spike color is pinkish-mauve rather than deep smoky pink-purple, and mature size sits 12–18 inches (30–45 cm) shorter.

Appearance

Size & Dimensions

Height1'6" - 2'6"

Width/Spread1'6" - 2'

Reaches mature size in approximately 2 years

Colors

Flower Colors

pink

Foliage Colors

green

Fall Foliage Colors

gold

Bloom Information

Bloom Period

~12 weeks

Summer Fall

Soft fluffy cylindrical bottlebrush spikes 2–4 inches (5–10 cm) long in pinkish-mauve with conspicuous long bristles appear from June through September over a 10–14 week window. Spikes age from fresh pinkish-mauve to tan across the bloom period and hold structure into autumn.

Detailed Descriptions

Flower Description

Soft pinkish-mauve with conspicuous long bristles; fluffy cylindrical bottlebrush spikes 2-4 inches; June-September aging tan

Foliage Description

Gray-green to blue-green; narrow 0.1-0.25 inch by 10-18 inches long; arching

Growing Conditions

Sun Requirements

SunFull Sun

Requires 6-10 hours of direct sunlight daily

• Full Sun: 6+ hours of direct sunlight

• Partial Shade: 3-6 hours of direct sunlight

• Full Shade: Less than 3 hours of direct sunlight

Soil Requirements

pH Range6.0 - 8.0(Neutral)

357912

Soil Types

loam sand chalk

Drainagewell drained

Water & Climate

Water Needs

Low

Frost Tolerance

hardy

Time to Maturity

1-2 years

Drought Tolerance

Drought tolerant when established

Care & Maintenance

Care Guide

Grow in full sun with 6 or more hours of direct light in well-drained lean-to-average loam, sand, or chalk at pH 6.0–8.0. The species tolerates dry, alkaline, and poor soils that suppress growth in most ornamental grasses, making it suitable for gravel gardens, xeriscape plantings, and chalk-soil positions where richer-soil grasses underperform. Full sun is needed for reliable flowering; partial shade reduces spike production by 30–50% and loosens the compact clump habit. Water deeply through the first growing season to establish, then rely on natural rainfall. No fertilization is needed. Cut back all foliage to 2–3 inches (5–8 cm) above ground in late February through March before new growth emerges. Hardy to USDA zone 6 (to –10°F / –23°C).

Pruning

Cut back all foliage to 2–3 inches (5–8 cm) above ground in late February through March before new growth emerges. Leave spikes and foliage standing through winter for structure and to shelter overwintering beneficial insects.

Pruning Schedule

early spring