Alert: Limited Online Availability

Now that fall is here, we have limited our stock for online purchase. Find Monrovia plants at your local garden center. Pre-order for 2023 will be available later this year. ×

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.
There are very few rules in gardening, but perhaps the most important one is to work within your zone. Choosing plants that grow and thrive in your particular climate is the very first step toward having a beautiful garden . Learn More

Your climate might be too cold for this plant:


Full sun

Allow soil to dry slightly before watering.


Due to the seasonal nature of plants, availability at your local garden center is not guaranteed. Give them a call before visiting.

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More Information
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.
Flower ColorBrown
Foliage ColorBlue-green
Garden StyleContemporary, Mediterranean, Rustic
Growth RateModerate
Landscape UseBorder, Groundcover
Light NeedsFull sun
Special FeatureDramatic Foliage Color, Easy Care, Improved Pest and Disease Resistance, Waterwise
Water NeedsModerate
Watering NeedsAllow soil to dry slightly before watering.
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:

Your climate may be too cold for this plant