Common tansy is a member of the Aster family. Originally imported from Europe as an ornamental, it is a perennial plant that grows from 1-½ feet to 6 feet tall with yellow button-like flowers and fern-like leaves. Reproducing by both seed and rootstock, tansy is difficult to control. Tansy is particularly aggressive when growing along irrigation ditches where it can restrict water flow.

Biological controls: None currently available.

Chemical controls: For additional information contact your local city, county or town natural resource office. (See section VII for phone numbers.)

Cultural controls: Repeated mowing or cutting will inhibit seed production. Pulling or digging is ineffective.

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