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Plant Profile: Argentine Blue-eyed Grass (Sisyrinchium striatum)

Sisyrinchium striatum 2This evergreen perennial is a native of Argentina and Chile where it grows in alpine grasslands, open woods, and meadows. It is not a true grass and is in the iris family, Iridaceae, that also includes crocus, gladiolus, and freesia. Plants are clump forming and have sword-shaped, gray-green leaves that are ½ to 1 inch wide and up to eighteen inches long. The creamy-yellow flowers have golden center and are up to ¾ inches across. They are cup-shaped and produced in early summer in dense erect unbranched spikes twelve to twenty-four inches long, with each spike carrying nine to twelve flowers. Each flower has six tepals veined with dark purple stripes on the underside. The leaves may yellow after flowering and can be cut back to six inches or fertilized to improve color. Plants flower better in cool climates that in the South.

Type: Evergreen herbaceous perennial

Bloom: Creamy yellow flowers in dense spikes in early summer

Size: 12-24” H x 18” W

Light: Full sun

Soil: Average, consistently moist, very well-drained

Hardiness: Zones 4-8

Care: Divide every two to three years; dead head to control reseeding

Pests and Diseases: None of significance

Propagation: Division, seed

Companion plants: Bearded iris, Siberian iris, Achillea ‘Moonshine’, Nepeta racemosa, Geranium ‘Johnson Blue’, Ajuga

Outstanding Selections: ‘Variegatum’ (creamy white margins on the leaves; needs some protection from intense sun.)