Reproducing only by seed.
Stems erect, often much-branched with opposite branches (usually 2 per node), 20-70cm high, usually covered with coarse spreading hair (Figure 3).
Flower heads are small, about 3-7mm across on short to long hairy stalks from axils of leaves (Figure 5). The ray florets are white, small with about 5 per head and only slightly longer than the yellowish-green to whitish disk florets (Figure 5). There are pappus-scales present on both the ray and tubular florets that are as long as the corolla tubes of the ray florets. Flowers from June to late autumn.
Hairy galinsoga is common throughout southern Ontario in gardens, roadsides and waste places, especially near towns and cities.
It is distinguished by its opposite, oval and coarsely toothed leaves on opposite-branched stems and its small flower heads each with 5 white tiny rays and a yellow disk.
Hairy galinsoga. A. Base of plant. B. Top of flowering plant.