Weeds of Container Nurseries in the United States

Galinsoga is a summer annual with erect stems. Leaves are opposite, roundish to triangular in shape, 1 to 3 inches long and 1/2 to 2 inches wide. The small flower heads have 4 to 5 white ray flowers and yellow disk flowers. Stems and leaves are hairy in the most common species G. ciliata, but G. parviflora stems and leaves are smooth or only sparsley hairy. In warmer climates, galinsoga is more common in spring and fall, less common in the summer. In cooler climates, germination can occur in spring, summer, or fall.