- Scientific Name: Sisyrichium idahoense
- Family: Iridaceae
- Common Names: Blue-eyed grass, Idaho blue-eyed grass
- 1 Taxonomy
- 2 Description
- 3 Bloom Period
- 4 Distribution
- 5 Habitat
- 6 Uses
- 7 Propagation
- 8 Photo Gallery
- 9 References
|Genus:|| Sisyrinchium L.|
|Species:|| Sisyrinchium idahoense E.P. Bicknell|
Showy, tufted perennial to 40 cm tall; stems usually flattened and wing-margined. Leaves mostly basal, long (to 20 cm.) and very narrow (< 2 mm broad).
Flowers consisting of 6 tepals, blue to purplish-blue with yellow centers. Flowers are small (about 2 cm across) and arranged in a terminal cluster of two to five flowers above a pair of sheathing, leaf-like bracts, emerging much lie irises.
1 prominent pistil and 3 stamens, ovary in inferior and pubescent.
March to June
Both S. i. var. occidentale (outer tepals 8-13 mm, inner spathe 12-20mm; spathe keel margins entire) and S. i. var. segetum (outer tepals 10-17 mm; spathe keel margins generally denticulate) have been reported in the South Salish Sea region. 
Moist to wet grassy meadows, vernal seepage areas, marshes, roadside ditches; at low to middle elevations 
Fine to well-drained.
Soil Reaction / Salinity
Mildly acidic to alkaline (pH 5.5 to 7.5) 
Full sun to partial shade 
Considered a "weedy" species and a good early secession species after disturbance. 
Possible reclamation species in moister pockets in selected sites 
Solitary bees of the family Megachilidae are mainly responsible for cross-pollination in natural populations. 
Mass-plant to create a showy display in a border or a rock garden 
Flowers are protandrous, thereby promoting out-crossing and at the same time reducing the chances for self pollination. S. idahoensis is an octoploid species and often exhibits a lag of up to 24 hours between anther maturation and stigma receptivity 
Fruit and Seed Collection and Extraction
Collect capsules by hand when ripe into collecting bags. Allow to dry further and then shake bags to extract seeds 
Cold store at 5º C for up to three years 
Fruit/Seed Dormancy and Treatment
Seal seeds in a Ziploc-style bag or a Rubbermaid-style container in equal amounts of seed to perlite or vermiculite, and add just enough water to moisten the mixture. Cold stratify at 5º C for 8 to 12 weeks 
Outplanting Characteristics and Requirements
Out-plant in the fall to take advantage of natural moisture or plant in spring and provide supplementary watering. Successfully self-seeds in situ. Can be successfully divided in situ in the spring by simply teasing plants apart and replanting the resulting clumps 
- Pojar and MacKinnon, 1994
- Bowcutt, F., & Hamman, Sarah. (2016). Vascular plants of the South Sound prairies (First ed.). Olympia, Washington: The Evergreen State College Press.
- Hitchcock, C. L., Cronquist, A., Giblin, D., & Legler, B. et al. (2018). Flora of the Pacific Northwest: an illustrated manual. Seattle: University of Washington Press.
- Henderson, 1976
- Tenenbaum et al., 1994
- Alverson, 2002
- Winters, 2002
- Schultz et al., 2001
- R. Bridgeman, pers. comm.