Blue Oat Grass (Helictotrichon sempervirens)

General Plant Information (Edit)
Plant Habit: Grass/Grass-like
Life cycle: Perennial
Sun Requirements: Full Sun
Full Sun to Partial Shade
Water Preferences: Mesic
Dry Mesic
Soil pH Preferences: Neutral (6.6 – 7.3)
Slightly alkaline (7.4 – 7.8)
Moderately alkaline (7.9 – 8.4)
Minimum cold hardiness: Zone 4a -34.4 °C (-30 °F) to -31.7 °C (-25 °F)
Maximum recommended zone: Zone 9b
Plant Height: 48 inches
Plant Spread: 24 inches
Leaves: Semi-evergreen
Other: stiff gray-blue leaves; do not cut back, instead hand-rake dead leaves in spring.
Bloom Size: Under 1"
Flower Time: Summer
Suitable Locations: Xeriscapic
Uses: Provides winter interest
Resistances: Deer Resistant
Drought tolerant
Propagation: Other methods: Division
Miscellaneous: Tolerates poor soil

full-grown clump in border

Photo gallery:
Location: Downingtown, PennsylvaniaDate: 2010-06-19full-grown clump in border
By ILPARW
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Location: Downingtown, PennsylvaniaDate: 2012-02-03the clump in winter
By ILPARW
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Image Courtesy of Bloomin Designs Nursery Used with Permission
By vic
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Image Courtesy of Bloomin Designs Nursery Used with Permission
By vic
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Comments:
Posted by jmorth (central Illinois) on Feb 29, 2012 4:23 PM

Recipient of RHS Award of Garden Merit.

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Posted by ILPARW (southeast Pennsylvania - Zone 6b) on Feb 19, 2019 10:03 AM

Back in summer of 2003 I bought three Blue Oat-Grasses from Limerock Ornamental Grasses, a mostly mail order nursery of ornamental grasses that was also a local nursery, that used to exist in Port Matilda, Pennsylvania by mail as tiny plants in tiny pots. I planted them in the front yard area. Here in 2019 the three are still looking good. I did have to dig up and reset one that had part of the clump die out. They were thriving better when there was less shade due to the trees growing larger, but they are still fine with some part shade. This is a lovely plant from Europe. In winter it is a brownish-blue evergreen plant. I find this to be a more reliable choice than the smaller Blue Fescue grass that is sold much more often at conventional nurseries. Some larger, diverse conventional nurseries and mail order nurseries sell this species. I only see it infrequently in the Midwestern or Eastern US, as it is largely unknown.

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Plant Events from our members
MrsBinWY On January 21, 2018 Seeds sown
2-4 weeks @ 64-71 degrees; 4-6 weeks @ 24-39 degrees; germinate at 41-53 degrees. Seeds from seedrat.
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Discussion Threads about this plant
Thread Title Last Reply Replies
Anyone recognize this grass? by wcgypsy Aug 11, 2018 6:54 AM 4
what is this plant? by mvoong Jul 6, 2017 10:19 PM 7

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