Silver Sage

Artemisia ludoviciana

Asteraceae

• Spokane Native
• Full Sun
• Size: 2'-3' tall x 2’-4' wide 
• Drought Tolerant: Yes
• Evergreen: No
• Flowers Color: Tiny yellowish-gray, inconspicuous (July–October)
• Wildlife Value:  Larval host for several grasshopper and moth species; aromatic foliage provides cover for small mammals; deer and rabbit resistant; dried stems and seed heads provide winter bird cover

Artemisia ludoviciana — silver sage, white sage, or prairie sage — is one of the most widely distributed native perennials in North America, occurring across virtually the entire continent from British Columbia and Alberta south to Mexico, and from the Pacific states east to the Great Lakes. In the Spokane region it is native to dry prairies, open hillsides, rocky slopes, roadsides, and disturbed areas east of the Cascades, where it thrives in the lean, well-drained soils and dry summers that characterize the Inland Northwest. SpokaneScape lists it as a regional native (V) and notes it can be a spreader — an important consideration for managed garden settings. It spreads by underground rhizomes and by self-seeding, and can colonize open ground vigorously in ideal conditions. In lean, dry, rocky soils its spread is slower and more contained; in richer, moister soils it can become aggressive. Soil barriers or regular division can contain spread where needed. The species name ludoviciana refers to Louisiana (where early botanical specimens were collected), though the plant is native to much of the continent, not specifically the Southeast.

Silver sage is grown almost entirely for its foliage — one of the most striking silver-gray leaf effects available in a hardy perennial. Erect, branching stems clothed in lance-shaped, aromatic leaves (2–4 inches long) with dense woolly white to grayish hairs create a luminous silver-white column that contrasts dramatically with green-leaved neighbors and glows in evening light. The foliage is fragrant when bruised — a clean, sage-like scent used for centuries in ceremonial smudging by Indigenous peoples of North America. The flowers themselves are tiny, yellowish-gray, and lack ornamental value; many gardeners remove them to prevent self-seeding and to keep the foliage display tidy. Several garden cultivars have been selected for specific foliage characteristics: 'Silver King' has dense, downy silvery-white foliage; 'Silver Queen' features finely divided, deeply cut silvery leaves; 'Valerie Finnis' has jagged-margined silvery-gray leaves and is less aggressive than the others, earning the Royal Horticultural Society's Award of Garden Merit. All cultivars share the same cultural requirements as the straight species.

Artemisia ludoviciana carries an extraordinarily rich ethnobotanical history. It was one of the most widely used ceremonial and medicinal plants among the Indigenous peoples of North America — used by the Blackfeet, Lakota, Cheyenne, Comanche, Pawnee, Navajo, and dozens of other nations. Bundles of dried stems were burned for purification and smudging rituals, with the aromatic smoke used to cleanse people, spaces, and objects before ceremonies. Medicinally it was applied for headaches, fever, and as a topical antiseptic; leaves were stuffed into shoes and saddles as a deodorant; fibers were used for cordage and weaving; and leaves were used to flavor foods. As a garden plant, the aromatic foliage is avoided by deer and rabbits. It serves as a larval host for several native moth and grasshopper species. The dense stem structure provides winter cover for small mammals and overwintering insects. The genus Artemisia is named for Artemis, Greek goddess of the moon, wild animals, and hunting — a fitting namesake for one of the most ecologically and culturally significant plants of the western plains.

Silver sage functions primarily as a foliage accent and contrast plant, where its luminous silver-gray color provides a unifying thread through the border and lightens the visual weight of darker-leaved companions. It is most effective in mass plantings, as a repeated accent, or as an informal hedge in xeriscape and prairie-style gardens. Its spreading habit makes it well suited to slopes, erosion-prone banks, and large-scale naturalized areas where it can colonize freely. In managed borders, use soil barriers or divide regularly to keep it in bounds. The silver foliage pairs beautifully with warm-toned companions: Rudbeckia fulgida 'Goldsturm,' Asclepias tuberosa (butterfly weed), Echinacea purpurea, Gaillardia aristata, and Helenium autumnale all provide vivid color contrast against the silver backdrop. For a cool-toned combination, pair with Salvia nemorosa, Nepeta faassenii, and Baptisia australis. Within the native plant community it grows naturally with Penstemon speciosus, Eriogonum species, Festuca idahoensis, and Achillea millefolium — all effective companion plants for a cohesive dry-meadow planting in the Spokane region.