Why Is It a Noxious Weed?
Mediterranean sage has the capability to invade and establish in dry pastures and rangeland throughout much of eastern Washington. It is non-palatable and it will outcompete beneficial forage plants.
How would I identify it?
It is an erect, coarse biennial, or short-lived perennial, with a stout taproot. When crushed, a sage-like odor is emitted. The mature plant can reach 3 feet tall. The overall plant is covered with dense, woolly hairs, especially when young.
Woolly clusters of four to six flowers are found in whorls at branch tips. Flowers are white to yellowish and about ½ inch long. Two upper petals form a lip resembling a hooked beak. 3 lower petals form 3 lobes, with outer lobes larger than the central.
Basal leaves have irregular or indented margins. They are 4 to 12 inches long and have petioles. Upper leaves are opposite, smaller and they clasp the stem. Uppermost leaves are reduced to bracts with long tapering points and are often tinged purple.
Flowering stems bolt as a single, squarish stalk developing into a much-branched inflorescence with many small white flowers that resembles a candelabra.
Fruit Seed Description
Flowers form 4 nutlets, with each nutlet containing one seed.
May Be Confused With
Its rosettes may be confused with rosettes of common mullein (Verbascum thapsus). Some differences are: mullein leaves are not stalked and leaf color has a yellow tint. If you need help with identification, contact your county noxious weed coordinator.
Where does it grow?
In its native range, it grows in dry soils and disturbed habitat. Outside of its native range, it prefers well drained soil and inhabits drained riparian areas and dry pastures. It will initially inhabit disturbed areas and then spread to other areas. Please click here to see a county level distribution map of Mediterranean sage in Washington.
How Does it Reproduce?
Mediterranean sage reproduces by seed and acts like a tumbleweed to disburse its seed by stalks breaking off and the plant being moved in the wind.
How Do I Control It?
Individual plants may be dug out. Mowing several times during the season will prevent seed production, but the rosettes are so low they escape damage. Mowing too late in the season will spread the seeds. Tillage is an option in accessible areas.
Long-term maintenance includes an integrated approach for the management of rangelands to prevent overgrazing and to promote forage plant establishment.
The Mediterranean sage root weevil, Phrydiuchus tau is a biological control agent that is used in Idaho and Montana. Since the eradication of Mediterranean sage is required in Washington, biological control is generally not a good management option here. For more information about biological control, please visit the WSU Extension Integrated Weed Control Project.
Herbicide information is currently not included in the PNW Weed Management Handbook for Mediterranean sage but check back as this resource is continually being updated. See the additional links below for information or contact county noxious weed coordinator.
For More Information
See our postcard for early detection information about Mediterranean sage.
See our Written Findings for more information about Mediterranean sage (Salvia aethiopis).
Stevens County NWCB Fact Sheet on Mediterranean sage
Asotin County NWCB Fact Sheet on Mediterranean sage