Evergreen oat-grass (Helictotrichon sempervirens)

Evergreen oat-grass

Helictotrichon sempervirens, or blue oat grass, is a species of flowering plant in the Poaceae family of true grasses, native to central and southwest European grasslands. It is a bunchgrass often used as an ornamental grass in garden design and landscaping.

Scientific classification

Species

Evergreen oat-grass (Helictotrichon sempervirens)

Grasses, sedges and allies

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Perennial

Lifespan

Grass

Plant Type

Late spring, Summer

Bloom Time

61 cm to 91 cm

Plant Height

60 cm to 75 cm

Spread

Blue, Green, Gray, Silver

Leaf Color

Brown, Copper

Fruit Color

Summer

Growth Season

Slow

Growth Rate

Quickly Identify Evergreen oat-grass

Distinct blue-gray foliage resembling porcupine quills.

Long, narrow leaves with smooth texture and parallel vein pattern.

One-sided drooping clusters of pale blue flowers on arching stems.

Produces light tan flowers on erect spikes in mid-summer.

Forms an evergreen, clump-like mound reaching 2 feet (60 cm) in height.

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Care Guide for Evergreen oat-grass

Twice per week

Water

Full sun

Sunlight

Garden Soil

Soil Type

Water: Evergreen oat-grass thrives in well-drained soils and moderate moisture, originating from temperate regions. It requires watering twice a week for optimal health and is drought-tolerant. As an ornamental grass, evergreen oat-grass is resilient across climate zones, adapting its water needs to seasonal temperature changes.

Fertilize: Fertilize evergreen oat-grass annually using a thin layer of mulch or compost in spring to enhance growth and soil health. Avoid over-fertilizing, which can harm evergreen oat-grass, and monitor soil fertility for adjustments. Ensure no runoff into waterways occurs to maintain environmental health.

Pruning: Evergreen oat-grass features blue-green foliage and arching stems. Annual early spring pruning improves growth by removing dead material and encourages dense foliage. Regular pruning minimizes pests and diseases, revitalizing the plant for robust growth and an attractive appearance.

Propagation: Evergreen oat-grass is valued for its blue-gray foliage and hardiness. Propagation through division is most effective; split clumps in early spring, ensuring each has roots. Replant quickly and supply adequate water for healthy growth.

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