Koeleria spp.

Poaceae

Temperate Northern Hemisphere (Europe, Asia, North America)

Deer Resistant Drought Tolerant Container Friendly

Native to North America

SunFull Sun

WaterLow · drought-tolerant

HardinessZones 3–8

Overview

Koeleria spp. is a genus of about thirty species of cool-season, tuft-forming perennial grasses in the family Poaceae, spread through temperate grasslands of the Northern Hemisphere with a few species in southern Africa and South America. Plants form dense clumps 8-24 inches (20-60 cm) tall of narrow, often blue-green or grey-green leaves 2-12 inches (5-30 cm) long, with rolled or flat blades and finely hairy or smooth surfaces. In late spring to early summer, slender stems carry a tight, spike-like panicle 2-5 inches (5-13 cm) long that is silvery green to straw-coloured, narrowing and lengthening as the seed ripens. Many species, such as K. macrantha and K. pyramidata, grow on dry, lime-rich, or sandy soils in open prairie and steppe. The clumps stay compact and do not spread by runners, though they self-seed where soil is bare. Koeleria spp. tolerates drought, poor soils, and cold once established but is short-lived on heavy, wet ground and can decline after a few years without division.

Native Range

Koeleria spp. is native across the temperate Northern Hemisphere, including Europe, central and northern Asia, and North America, with outlying species in southern Africa and southern South America. Plants grow in dry grassland, prairie, sand dunes, and rocky open slopes, often on calcareous or sandy soils.

Suggested Uses

Koeleria spp. is used in dry meadows, prairie and steppe plantings, rock gardens, green roofs, and as a slender edging in low-water borders. Its compact clumps and early seed heads suit naturalistic and gravel gardens. It is less suited to rich, moist beds, where it grows lax and short-lived.

How to Identify

Look for a small, dense tuft of narrow, often blue-green leaves and upright flowering stems topped by a narrow, spike-like panicle that looks almost cylindrical before the seed sets. The panicle is silvery green to pale straw and contracts after flowering, with short branches held close to the main axis. The compact clump and shining, dense flower head separate Koeleria spp. from looser-headed meadow grasses.

Appearance

Size & Dimensions

Height8" - 2'

Width/Spread6" - 1'

Colors

Flower Colors

Foliage Colors

Fall Foliage Colors

Bloom Information

Bloom Period

~4 weeks

Spring Summer

Flowering stems appear from late May through July, depending on climate and elevation. The spike-like panicles colour silvery green, then fade to straw as seed ripens over several weeks. Seed heads often persist into late summer.

Detailed Descriptions

Flower Description

silvery green to straw

Foliage Description

blue-green to gray-green

Growing Conditions

Sun Requirements

SunFull Sun

Requires 6-12 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

sand loam chalk rocky

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

Plants grow in full sun on well-drained, low to moderately fertile soils, including sandy, gravelly, and lime-rich ground. Established clumps tolerate drought and need little or no summer water in temperate climates. Rich soil and excess moisture cause loose, floppy growth and shorten the plant life. Most species are cold-hardy, tolerating temperatures well below 0F (-18C). Cutting clumps back in late winter clears old growth before the new flush. Dividing the clumps every few years keeps them vigorous where they begin to thin at the centre.

Pruning

Old foliage and spent seed stems can be cut back to a few inches in late winter or very early spring before new growth starts. Clumps that thin or die out in the middle can be lifted and divided to renew them. No other routine pruning is needed.

Pruning Schedule

winterearly spring