Native to Europe, but introduced to North America as a garden plant, and now spread throughout the eastern half of North America as well as along the west coast, and in the central states of Colorado, Kansas, and Nebraska.
Used as an attractive groundcover in landscape plantings, but easily escaping to other areas. Reproduction can be from seeds, but the primary spread of the plant is by the creeping stems that root at the nodes. Plants do best in shaded, moist habitats, but also are problems in turf and landscape, and can be found along ditchbanks and in other disturbed sites.
Plants are prostrate with long, creeping stems up to 20 inches in length. Leaves are opposite and neatly spaced along the stems, attached to the stem without a very short stalk. Leaves are round to somewhat squared, with palmate venation and about 1 inch in diameter. The flowers are bright yellow and produced singly on stalks that arise from the leaf axils.
Characteristicts Important to Control:
A systemic herbicide may be needed to effectively kill all underground parts, and when present in turf a selective broadleaf product will be needed.