Sweetgrass (Odorata)

The Sweetgrass (Odorata) is generally described as a perennial graminoid. This is native to the U.S. (United States) has its most active growth period in the spring and summer and fall . The greatest bloom is usually observed in the mid summer, with fruit and seed production starting in the summer and continuing until fall. Leaves are not retained year to year. The Sweetgrass (Odorata) has a moderate life span relative to most other plant species and a moderate growth rate. At maturity, the typical Sweetgrass (Odorata) will reach up to 2 feet high, with a maximum height at 20 years of 0 inches.

The Sweetgrass (Odorata) is easily found in nurseries, garden stores and other plant dealers and distributors. It can be propagated by seed. It has a slow ability to spread through seed production and the seedlings have low vigor. Note that cold stratification is not required for seed germination and the plant cannot survive exposure to temperatures below -38°F. has low tolerance to drought and restricted water conditions.

Uses of : Landscaping, Medicinal, Culinary, etc.

Caution: Coumarin, a natural anticoagulant, gives sweetgrass its characteristic sweet smell (Lewis 1977). It has potentially toxic properties and can cause liver injury and hemorrhages. Research has shown coumarin and related compounds to be effective in reducing high-protein edemas, especially lymphodema (Leung 1980).

Ethnobotanic: Sweetgrass was and still is used ceremonially through burning the dried and braided grass stems for an incense or smudge. The fragrant smoke is used for purification and to carry prayers to the Great Spirit. Hierochloë literally translates from Greek as sacred (hieros) and grass (chloë) or “holy

grass” (Hitchcock et al. 1973). Indian people call sweetgrass the “grass that never dies.” Even when it is cut, it retains its fragrance and spirit (Youngbuck pers. comm. 1999). Today, sweetgrass is used inter-tribally throughout the country. Sweetgrass was used ceremonially by many tribes, including the Omaha, Ponca, Kiowa, Dakota, Lakota, Blackfeet, Cheyenne, Pawnee, and Winnebago (Jordan 1965, Moerman 1986). The Cheyenne, Blackfeet, and Lakota use sweetgrass in the Sun Dance (Kindscher 1992, Hart 1976). Sweetgrass symbolizes life’s growth for the Cheyenne (Ibid.).

Sweetgrass was the most popular perfumery of the Blackfeet, who braided it and kept it with their clothes like a sachet or carried it in small bags (McClintock 1909). The Cheyenne mixed sweetgrass with pineapple weed (Matricaria matricarioides) to use as a perfume (Hart 1976). The Thompson Indians used an infusion of the plant as a wash for the hair and body (Moerman 1986). The Blackfeet and the Gros Ventre used sweetgrass as a hair rinse to achieve a lustrous shine (Hart 1976).

Blackfeet women made a tea from sweetgrass that was drunk to stop vaginal bleeding after birth and to expel the placenta (Hellson 1974). Women burned sweetgrass braids after their moon time to finish the cleansing. Blackfeet men drank sweetgrass tea to treat venereal infections. Both sexes drank a tea from this plant to treat coughs and sore throats. Windburn and chapping were treated through an infusion of sweetgrass stems soaked in water or a salve of sweetgrass water and grease. The sweetgrass water was also used as an eyewash. Sweetgrass was mixed with seeds of meadow rue (Thalictrum occidentale) to make a tea to clear congested nasal passages (Kindscher 1992). The Karok of northern California used an infusion of sweetgrass to treat women who had suffered a miscarriage (Strike 1994). Pregnant women drank this infusion to arrest fetus growth. The Karok also fed sweetgrass to sick dogs.

Among the Chippewa, sweetgrass was used as an incense or smudge in ceremony, as a spiritual medicine, and in basketweaving (Densmore 1974). The use of incense is more characteristic of the Plains Indians than of the Algonquian tribes (Ibid.). According to Densmore, “Men would smudge before hunting to purify body and spirit. Medicine men kept sweetgrass in the bag with their medicinal roots and herbs. Strands of sweetgrass were made into coiled basketry by means of cotton thread. This took the form of bowls, oval and round, and of flat mats. Birch bark was sometimes used as the center of these baskets, with the coils of sweetgrass being sewed around it.”

Sweetgrass was used in coiled baskets, primarily in the northeast. The Paiute used sweetgrass woven with willow bark in the hoods of cradleboards. The Central-Northern Algonkians, Iroquoians, and Hurons edged woodsplint basketry and vessel borders with sweetgrass (Turnbaugh et al. 1986). Central-Northern Algonkian peoples are known for their production of flexible weft-twined bags, and some created bundle-coiled baskets of sweetgrass. Northern New England basketry intermixed wood splints with twisted or braided sweetgrass in one basket (Pelletier 1982, Turnbaugh et al. 1986). In the northeast, the Ojibwe, Potawatomi, Winnebago, Menominee, Mohawk, Penobscot, Passamaquoddy, and Abenaki (Tur

General Characteristics

General: Grass Family (Poaceae). Sweetgrass is a fragrant, rhizomatous, perennial grass that reaches a height of 7 dm. (30 in.). The stems are hollow and hairless with open sheaths. The leaf blades are flat at maturity, usually glabrous, 10-30 cm. (3.9-11.8 in.) long. The sweetgrass inflorescence is an open panicle 4-9 cm. (1.6-3.5 in.) long; the lower branches are drooping to spreading. The spikelets are three-flowered, the two lowest florets staminate (male) and the uppermost is perfect (both female and male). Sweetgrass is an early blooming plant and flowers from May to July.

Required Growing Conditions

For current distribution, please consult the Plant Profile page for this species on the PLANTS Web site. Sweetgrass grows in wet meadows, low prairies, and the edges of sloughs and marshes in Minnesota, North Dakota, Montana, South Dakota, northwest Iowa, and western and central Montana. It grows from Labrador to Alaska, south to New Jersey, Indiana, Iowa, New Mexico, and Arizona. It is also native to Eurasia. Sweetgrass grows below 1830 m in California and is rare in the state, occurring in the north High Cascade Ranges and extending north (McGregor 1991).

Cultivation and Care

Adaptation: Sweetgrass is a rhizomatous perennial that is native to cooler regions of North America and Europe. It is found in moist, cool meadows, shaded stream banks, and cool mountain canyons (Dorn 1984). Caution: Due to prolific rhizome production, it can be moderately invasive.

In its native habitat, sweetgrass grows primarily in wetlands and riparian areas. Due to the loss of wetland habitat throughout the United States, it is rarely appropriate to harvest wild plants. Wild harvests should be restricted to salvage sites with appropriate approvals or permits. Sweetgrass populations are declining due to harvesting for both personal and commercial use. The species is subject to over-collecting and is sensitive to grazing. Indian elders are quoted as saying “Today sweetgrass has become scarce and is hard to find” (Hart 1976).

The following information on the propagation of sweetgrass is obtained from the Bridger Plant Materials Center (1996 and 1999) and Susan Winslow (1999).

Propagation from Cuttings: Sweetgrass can be propagated easily from container or bare rootstock, as it produces many rhizomes. It can also be propagated from seed. However, in nature, sweetgrass is a sporadic seed producer, and germination rates are fairly low (25-30%), so propagation from seed is more difficult than from cuttings or division of plants.

Handling and care requires commitment and attention to detail to maximize survival. Initially, the plants should remain in the pots for an additional 2-3 weeks after you receive them, and watering must occur every day while in the pots. This is because of the possibility of lingering transplant shock and because the soil in the pots dries out fairly quickly. The plants will continue to grow and thrive in the original containers for quite a period of time while site location and preparation efforts are finalized.

Pick the sites where sweetgrass is to be transplanted carefully, and prepare the site properly before planting. It is advisable to keep the immediate planting area clear of competing vegetation, which may simply mean hand weeding around individual plants, or a mechanical means may be required. Sweetgrass grows in wetter areas in its natural habitat, and during the establishment period irrigation is likely to be required. Soil should be kept very wet to moist.

For plants grown in greenhouse flats or collected from the wild, it is best to dig up and separate plants in late fall or winter (Hartman et al. 1990). This is the “quiescent” period that follows seed maturation, and leaves are senescent (dried up and brown colored). When separating plants, ensure that each “plantlet” has a rhizome or rhizome bud. Each plant should be planted in full sun in a light, loose soil. Plants should be planted on 3-foot centers; they will fill in and make solid stands of sweetgrass in one to two years. Plants need to be kept moist, and need frequent watering. Plants may need to be protected from herbivores, such as rabbits or gophers. Dogs love sweetgrass and will selectively eat the shoots and roll in the grass.

General Upkeep and Control

After the plants have established and grown to a minimum height of 4 to 6 inches (to avoid damaging small seedlings) routinely weed and remove unwanted vegetation. This will reduce competition for light, nutrients, and water, and encourage vigorous plant growth and development. Sweetgrass prefers a moist environment, so regularly water the site. The rhizomes (underground, horizontal stems) develop early and will emerge during the first growing season. The grass will continue to spread if left unattended. The leaves will reach a length of approximately 12-15 inches and can be harvested once or twice a year. The foliage is very relaxed and it will be necessary to carefully lift the leaves and cut the stems close to the ground (leave 1 to 2 inches of plant stem). The actual number of harvests per year will depend on climatic conditions, seasonal timing, and the traditional environmental knowledge of the particular indigenous group tending the grass. Plan the final harvest (late summer in northern climes) so that there will be adequate time for the plants to prepare for the onset of cold temperatures and winter conditions. If this natural hardening-off process does not occur, it will eventually have a detrimental effect on the long-term persistent and survival of the stand. Fertilizing is not recommended in the first year of establishment, as weeds would reap the most benefit during that time. The use of a balanced, all-around, granular fertilizer is recommended after the first year.

Traditional Resource Management: The following information on sweetgrass was provided by Lynn Youngbuck, who is Cherokee, Chiracahua, and Fox: 1) take only what you need, leaving the best to reproduce; 2) speak to the plant, leave an offering of tobacco or sage before harvesting; the plant will grow back two stems for every one cut; 3) we humans are another strand in life; plants sustain us and should be treated as another living being; 4) plants were taken care of by extended family groups of women; they were taken care of and watched each year for generations; and 5) materials harvested were shared and traded with the whole tribe.

Plant Basics
Growth Rate Moderate
General Type Graminoid
Growth Period Spring, Summer, Fall
Growth Duration Perennial
Lifespan Moderate
Plant Nativity Native to U.S.
Commercial Availability Routinely Available
Physical Characteristics
Bloom Period Mid Summer
Displays Fall Colors No
Shape/Growth Form Bunch
Drought Tolerance Low
Shade Tolerance Intermediate
Height When Mature 2
Vegetative Spread None
Flower Color Yellow
Flower Conspicuousness No
Fruit/Seed Abundance High
Fruit/Seed Seasonality Summer Fall
Seed Spread Rate Slow
Gardening Characteristics
Propagations (Ways to Grow) Seed
Moisture Requirements High
Cold Stratification Required No
Minimum Temperature -38
Soil Depth for Roots 12
Toxic to Nearby Plants No
Toxic to Livestock No
After-Harvest Regrowth Rate Moderate
After-Harvest Resprout Ability No
Responds to Coppicing No
Growth Requirements
pH Range 5.7–7.4 pH
Precipitation Range 16–16 inches/yr
Planting Density 0–0 indiv./acre
Soil Textures Coarse, Medium
Soil Depth for Roots 12
Minimum Frost-Free Days 130 day(s)
Salinity Tolerance Medium
CaCO3 Tolerance Medium
Sustainability & Use
Leaf Retention No
Palatability Medium
Fire Resistant No
Causes Livestock Bloating None

Source: USDA, NRCS, PLANTS Database, plants.usda.gov.
National Plant Data Center, Baton Rouge, LA 70874-4490 USA