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Star-shape blue-purple flowers decorate blue-eyed grass in spring and early summer. A wonderful plant for edging a walkway or the front of a cottage garden border, this compact perennial grows in a slowly spreading clump. Although “grass” is in its name, blue-eyed grass is actually in the iris family. Its sturdy leaves remain green and upright throughout the growing season.
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Part Sun, Sun
Under 6 inches to 3 feet
6-10 inches, depending on variety
Blue-eyed grass complements a host of perennials. Plant it at the base of clematis as an easy-care groundcover. Partner it with New Zealand flax and enjoy the distinct textures of both plants' straplike leaves. Blue-eyed grass also pairs well with all types of roses; both plants grow well in rich, well-drained soil.
Blue-Eyed Grass Care Must-Knows
An easy-to-grow plant, blue-eyed grass thrives in full sun or part shade and moist, well-drained soil. It produces a thick stand of healthy, dark green foliage when planted in soil that is rich in organic matter. Prior to planting, enrich the planting area with well-decomposed compost, mixing it into the soil in the planting hole and the surrounding area.
Plant nursery-grown transplants 18 to 24 inches apart in early spring. Water plants regularly through the first growing season to promote a strong root system. Blanket the soil around plants with a 2-inch-thick layer of mulch to prevent soil moisture loss.
You may want to cut blue-eyed grass back to the ground after blooming has ended to avert unwanted self-seeding. Plants may need to be divided every few years in early spring to maintain vigorous growth. Blue-eyed grass tolerates division and replanting well.