Russian knapweed is a deep-rooted, herbaceous perennial that spreads by seed and vegetative root buds. This article summarizes the effect of various herbicides and application timing on Russian knapweed control.Read More
Common tansy (Tanacetum vulgare L.), also known as garden tansy and golden buttons, is a perennial forb that reproduces by seed and rhizomes. Read more about identification and management of this invasive plant.Read More
Several biennial thistles are problematic in North America including bull thistle (Cirsium vulgare), musk thistle (Carduus nutans), plumeless thistle (Carduus acanthoides), and Scotch thistle (Onopordum acanthium).Read More
Herbicides play an important role in integrated management of yellow starthistle and can be used alone or in combination with other techniques such as timely mowing, grazing, burning, or use of biological control insects.
Spotted knapweed (Centaurea stoebe) is a tap-rooted perennial forb that spreads by seed. Seedlings and mature plants over-winter in a rosette stage and resume growth in early April. Spotted knapweed blooms from mid to late July through mid September.Read More
Yellow sweetclover (Melilotus officinalis) and white sweetclover (M. alba) are herbaceous, non-native legumes that are widely distributed in the United States. Learn about the biology, ecology, and management recommendations for sweetclover.
Photo by Elizabeth Bella, USDA Forest Service, Bugwood.orgRead More