Blue Oat Grass

Helictotrichon sempervirens

Graceful fountains of silver-blue blades form neat ornamental clumps that combine well with other grasses. Airy, beige to light brown, terminal panicles appear mid- to late summer. A reliable and attractive accent or specimen, perfect for rock gardens. May remain evergreen in mild winter regions.
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Full sun

Water regularly, allowing soil to dry slightly between intervals.

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Botanical Pronunciationhel-ik-toh-TREE-kon sem-per-VY-renz
Average Size at MaturityModerate growing; reaches 2 to 3 ft. tall and wide.
Bloom TimeSummer
Design IdeasBlue Oat Grass is at home in desert gardens as well as in the traditional perennial border. Plant beside landscape boulders, in rock gardens or at the edges of natural pools. Particularly beautiful planted in masses and paired with blue-gray Mediterranean plants.
Deciduous/ EvergreenSemi-evergreen
Flower ColorBrown
Foliage ColorBlue-green
Garden StyleContemporary, Mediterranean, Rustic
Growth HabitClumping
Growth RateModerate
Landscape UseBorder, Erosion Control, Firescaping/Firewise, Green Roof, Mass Planting, Rock Garden, Ground Cover
Light NeedsFull sun
Soil NeedsAll-Purpose Plant Food
Special FeatureClump Forming, Dramatic Foliage Color, Easy Care, Extreme Cold Hardiness, Improved Pest and Disease Resistance, Waterwise
Water NeedsModerate
Watering NeedsWater regularly, allowing soil to dry slightly between intervals.
Companion PlantsBarberry (Berberis); Weigela (Weigela); Sedum (Sedum); Yucca (Yucca); Lavender (Lavandula); Ajuga (Ajuga)

Grows easily in average, well-drained soils. Water deeply, regularly during the first growing season to establish an extensive root system. Once established, water regularly, but allow to dry out slightly between intervals for best foliage color. Drought tolerant in cool climates. Prune away old, faded foliage before new growth emerges in spring.

This Plant's Growing Zones: 4-9

USDA Cold Hardiness Zone Map

Your USDA Cold Hardiness Zone:

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