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Weed Identification in Nurseries and Landscapes

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Hairy galinsoga - Galinsoga quadriradiata Cav.
 
Hairy galinsoga plant
Young hairy galinsoga plant.
Hairy galinsoga
Hairy galinsoga leaf.
Life cycle: Prolific, seed-producing summer annual.

Leaves: Opposite, egg-shaped to triangular leaves with coarsely toothed margins, sharp tips and densely hairy upper leaf surfaces.

Stems: Erect with multiple, opposite branching stems. They are up to 2 feet tall and covered with coarse hairs.

Flowers and fruit: Numerous small flower heads are formed in terminal and axillary clusters. Each head has four to five white, three-toothed ray flowers and centers with numerous yellow disk flowers. The seed is enclosed in a single-seeded, brown to black, wedge-shaped, wind-disseminated fruit.

Reproduction: Seeds.
Hairy galinsoga flower
Hairy galinsoga flower.
 
The MSU IPM Program maintains this site as an access point to pest management information at MSU. The IPM Program is administered within the Department of Entomology, fueled by research from the Michigan Agricultural Experiment Station, delivered to citizens through MSU Extension, and proud to be a part of Project GREEEN.
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Updated: 10/12/07