Biology and Management
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|Common Groundsel Seedling
||Common Groundsel Flowers
||Common groundsel is a winter or summer
annual, but may act as a biennial. Plants have simple or branched upright growth, 6
to 18 inches tall. The foliage is generally smooth but may have light pubescence. Flowers
are yellow. Seeds germinate in early spring - late fall and 3 to 4 generations may develop
in one season. The cotyledons and young leaves on seedlings are purple on the underside.
Young plants appear as rosettes. Flowers in April - October. Seed can mature in opened
flowers even after the plants have been killed. Common groundsel contains the same
pyrrolididine alkaloids found in tansy ragwort. Biotypes have evolved that are resistant
to some herbicides. This weed prefers cool and wet environments with nutrient rich soil.
Common in mint west of the Cascade Mountains.
|Common Groundsel Mature
This section contains information on identification of
the different life stages of Common Groundsel. Select Biology and Management from the
Contents Menu for more information on the biology and management, or select Registered
Herbicides for the herbicides that are registered to control this weed in mint.