Frost Grass is a stunning ornamental grass that brings architectural drama to late-season gardens. Native to Siberia, Spodiopogon sibiricus grows 3 to 5 feet tall with a bamboo-like quality and foliage that shifts to rich purplish and wine tones as temperatures drop. Hardy through zones 5 to 9, it produces tall, airy flower plumes 8 to 12 inches long that rise 14 to 18 inches above the foliage from July through February, providing months of textural interest and dried flower appeal.
Partial Sun
Moderate
5-9
60in H x 24in W
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Moderate
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The foliage transforms dramatically in cool weather, shifting from green to deep purplish-wine hues that intensify through fall and winter. Tall, delicate flower plumes emerge mid-summer and persist well into winter, creating an airy, ethereal quality in the garden. The showy blooms are excellent for cutting and drying, extending their ornamental value long past the growing season.
Frost Grass is grown primarily for ornamental display and dried arrangements. Its tall, showy flower plumes are valued as cut flowers and hold their structure beautifully when dried for winter bouquets and dried flower designs. In the garden, it serves as a focal point for late-season interest and winter silhouettes.
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Seed germinates at temperatures between 60 and 75°F. Start indoors 6 to 8 weeks before the last spring frost to establish strong plants for transplanting.
Harden off seedlings gradually over 7 to 10 days before transplanting outdoors after the last frost date. Space plants 18 to 24 inches apart in moist, well-drained soil in full sun or light shade.
Direct sow seed after the last spring frost when soil has warmed to 60°F or above.
Harvest flower plumes for drying when they first emerge and are fully extended, typically from July onward. Cut stems with plumes 14 to 18 inches above the ground using sharp shears. Hang bundles upside down in a warm, dry location for 2 to 3 weeks until fully dried.
Cut back Frost Grass to the ground in late winter or early spring before new growth emerges, typically in March or April. This rejuvenates the plant and allows fresh foliage to develop with the best color displays.
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“Frost Grass carries its name and lineage directly from Siberia, where the species name sibiricus reflects its cold-climate origins. This hardy grass was selected by horticulturists for its exceptional frost tolerance and late-season ornamental value, making it a valuable addition to temperate gardens where few plants shine during winter months.”