Helictotrichon sempervirens

available mid May

Helictotrichon sempervirens

Blue Oat Grass

About This Grass

Helictotrichon sempervirens 'Sapphire' looks like a miniature water fountain with its densely packed spikey, blue-grey foliage gently spraying upward and arching back downward at the tips. In early summer, small, tan seed heads appear on tall stems held well above the foliage. It adds a wonderful coarse element to rock gardens and mixed borders. This grass does best in a dry sunny site where, once established it is very drought tolerant. Trim back the old foliage to 10 cms in the spring before the new growth emerges. It should be divided every 3-4 years in the spring to keep the plant looking fresh. When snow cover is heavy it will remain evergreen.

  • Height: 60 - 91 cm (24-36 in)
  • Spread: 60 - 71 cm (24-28 in)
  • Cold Hardiness: zone 3
  • Sun or Shade: Sun
  • Bloom Time: Summer
  • Leaf Colour: blue
  • Bloom Colour: bluish brown
  • Critter Resistance: deer and rabbits
  • Nature Attraction: none

Growing and Maintenance Tips

Blue Oat Grass is adaptable to a broad range of soil conditions but the best place to plant it is in a dry sunny site. Trim the old foliage back to 15 cms in the spring. Divide it in the spring every three to four years to keep the plants looking fresh. 'Sapphire' has shown greater resistance to the rust fungus that can affect this grass.