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Perennial, reaching 2-3 feet in height with a snapdragon type yellow flower. Flowering begins in June.
The deep rooted, perennial, found generally in rangelands, out-competes desirable forage plants for moisture and nutrients.
Residual controls are preferred because of the ability to regenerate from the roots. Repeat applications on an annual or semi-annual basis for 3-5 years will be necessary.
A defoliating moth is currently being introduced into Eastern Oregon.