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Species
Information
- giant
horsetail
- Equisetum
telmateia Ehrh. var. braunii Milde
- USDA
Symbol: EQTEB
- Oregon
Noxious Weed Designation: B
- Pictures
Identification:
Perennial; grows 1/2 to several ft tall. Aerial stems jointed and hollow except at nodes. Fertile stems tan with brown leaves, unbranched, and terminate in elongated, spore-bearing cones. Sterile stems green with many whorls of slender, jointed branches. Sterile stems arise after fertile ones and persist longer.
Impacts:
A native of Europe and northern Africa, giant horsetail rush is now common from Alaska to southern California. It generally grows in moist areas and is found west of the Cascade Mountains in Oregon. The plant spreads rapidly by rootstocks and often invades pastures and cropland from infested stream courses and ditch banks. It is not uncommon for topsoil used in landscaping and new construction to contain rootstocks for horsetail. Several species of horsetail are poisonous to livestock, especially horses; problems usually arise when dry plants are fed to stock in hay. Horsetail is a difficult plant to control once it has become established.
Biological
Controls: No approved biological control agent is available.
Oregon
Maps of Giant Horsetail Distribution
Links:
USDA
Plants Database information on giant horsetail
GRIN
Database information on giant horsetail
Oregon Department
of Agriculture information on giant
horsetail
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