Sweetgrass

Hierochloe odorata

Poaceae

• Spokane Native
• Sun-Part Shade
• Size: 3' tall x 1’ wide
• Drought Tolerant: No
• Evergreen: No
• Flower Color: Needle-like seed heads (May-June)
• Wildlife Value: Cultural significance, fragrant foliage, wetland habitat

Sweetgrass is a native perennial grass spreading by rhizomes to form loose colonies in moist meadows, wetland edges, and along streams. It occurs across northern North America and holds deep cultural and spiritual significance for many Native American tribes. The grass produces glossy, bright green leaves that remain fairly short, typically under 12 inches, with flowering stems reaching up to 3 feet tall. The foliage contains coumarin, which gives the plant its characteristic sweet vanilla-like fragrance, especially when dried. It prefers moist to wet soils and grows in full sun to part shade.

Flowering occurs from May through June with delicate, pyramid-shaped panicles rising above the basal foliage. The seed heads are small and subtle, described as needle-like in appearance. The grass spreads primarily through rhizomes rather than seed, gradually forming patches that can persist for many years. The sweet scent intensifies when the grass is crushed, dried, or braided. Sweetgrass remains green through much of the growing season, turning golden-tan in late fall.

Sweetgrass holds profound cultural importance as a sacred plant used ceremonially by numerous Indigenous peoples for smudging, basket weaving, and medicinal purposes. The dried grass is traditionally braided and burned to produce fragrant smoke used in purification ceremonies and prayers. It provides habitat value in wetland and riparian areas, offering cover and nesting material for wildlife. Due to overharvesting in some areas, sustainable cultivation and respectful stewardship of wild populations are important for conservation. When harvesting, traditional practice dictates taking only what is needed and leaving the roots undisturbed.

Sweetgrass thrives in rain gardens, wetland edges, moist meadows, and along streams or ponds where soils remain consistently moist. It works well in restoration plantings and cultural gardens. Plant in full sun to part shade with rich, moist soils. The grass spreads slowly but steadily through rhizomes, so allow adequate space or use barriers if needed to contain growth. Combine with other moisture-loving natives like sedges, native mints, and wetland wildflowers. Out of respect for its cultural significance, grow Sweetgrass with care and harvest sustainably if using for traditional purposes.