Photo by Melody

PlantFiles: Idaho Blue-eyed Grass
Sisyrinchium idahoense

Family: Iridaceae (eye-rid-AY-see-ee) (Info)
Genus: Sisyrinchium (sis-ee-RINK-ee-um) (Info)
Species: idahoense (eye-duh-ho-EN-see) (Info)

5 members have or want this plant for trade.


6-12 in. (15-30 cm)

9-12 in. (22-30 cm)

USDA Zone 3b: to -37.2 C (-35 F)

Sun Exposure:
Full Sun

Unknown - Tell us

Bloom Color:
Medium Blue

Bloom Time:
Mid Summer


Other details:
Average Water Needs; Water regularly; do not overwater

Soil pH requirements:
5.6 to 6.0 (acidic)
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)
7.6 to 7.8 (mildly alkaline)
7.9 to 8.5 (alkaline)

Patent Information:
Unknown - Tell us

Propagation Methods:
By dividing the rootball
From seed; direct sow outdoors in fall
From seed; winter sow in vented containers, coldframe or unheated greenhouse
From seed; stratify if sowing indoors

Seed Collecting:
Allow pods to dry on plant; break open to collect seeds

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No positives
No neutrals
1 negative

Gardeners' Notes:

Negative shortcm On Aug 8, 2004, shortcm from Wilmington, DE (Zone 7b) wrote:

Invasive in northern Delaware. I planted this 3 years ago, pulled it out 2 years ago, and am STILL pulling babies, even those with only 3 leaves. The tiniest baby grows rapidly into a large clump.. The flowers were very pretty, but very small. Grew in full sun and mostly-shade, dry and wet.


This plant has been said to grow in the following regions:

Wilmington, Delaware
Wilkes Barre, Pennsylvania

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