Galium tinctorium, commonly known as Stiff Marsh Bedstraw, is a perennial herb native to a variety of habitats including wet meadows, marshes, fens, river and stream banks, and moist woodlands across eastern North America, from Texas to Labrador and from Minnesota to Florida. It also occurs in eastern and central Mexico and the Dominican Republic. This plant typically grows to a height of 1-3 feet (30-90 cm) and spreads through rhizomes, forming dense mats. Stiff Marsh Bedstraw features whorls of narrowly lanceolate leaves and clusters of small, white, star-shaped flowers with four petals each, which bloom from June to September. The flowers are mildly showy and attract pollinators.

Stiff Marsh Bedstraw is valued for its ability to stabilize soil in wet areas and is sometimes used in restoration projects. It is also considered a noxious weed in some northeastern U.S. states due to its aggressive growth. In cultivation, it prefers full sun to part shade, consistently moist to wet soil conditions, and does not tolerate drought well. While it can be used for naturalizing in wetland gardens, care should be taken to control its spread in smaller garden settings. It has no major disease problems, but can become invasive if not managed properly.CC BY-SA 4.0