Blue Oat Grass
Helictotrichon sempervirens - Blue Oat Grass
More enduring than blue fescues, blue oat grass is the best choice for accents. The clear blue summer foliage echoes with dwarf blue spruce and blue junipers. For a dramatic effect, try Helictotrichon with deep maroon leaved canna lilies.
Blue oat grass is such an imposing sight that is has the ability to stop anyone dead in their tracks.
Note: We previously listing Helictotrichon sempervirens 'Saphirsprudel' as a separate plant, but we now list it under Helictotrichon sempervirens as we find no difference between the two in colour or in form.
Description: cool season; clump forming
Foliage is blue; 6 mm (1/4") wide; 50-60 cm (20-24") in height
Flowers in June through August; 50-100 cm(20-40") tall
Ideal conditions: full sun or light shade; fertile, moist soil; grows in a wide range of soil; good drainage is essential
Coldest zone: 3 (customers have reported growing this successfully in Winnipeg and Saskatoon, two very cold cities in Canada) (find your zone; further info on plant hardiness)
Partner with: Artemesia, Nepeta, Stachys, Rudbeckia, Penstemon, Cotinus coggygria (purple smoke bush), Rosa glauca, Allium sphaerocephalum
Season of interest: year-round in milder climates
Native to: meadows and dry hillsides Eurasia, western Mediterranean
Recommended plant spacing: 45-90 cm (18-36") why such a difference?
Drought tolerance rating: 2 (water to root depth once every 2 weeks); further info
Pronunciation: Helictotrichon (hel-ik-toh-TREE-kon) sempervirens (sem-per-VEYE-renz)
Sizes available: 4" pot size field clumps; gallon size field clumps
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