Horseweed
Scientific Name: Conyza canadensis
Weed Family: Asteraceae
Description
Horseweed is an annual weed, winter or summer, depending on location. Horseweed is an upright growing plant and can reach 4 – 5 feet if not mowed. Horseweed grows in a basal rosette. The leaves which are oblanceolate in shape are 3- to 4-inches in length. The leaves alternate and have margins that are toothed. The stem of horseweed is simple and unbranched, and covered with hair. Horseweed has a taproot. The inflorescence is a panicle of heads with pink to white flowers. Horseweed spreads by seed produced in the summer. Horseweed is found through out the United States.
Herbicide Use
Make a pre-emergence herbicide application prior to the seed germination. For post-emergent control use a product containing MSMA.
Distribution
Germination Dates
Zone-3: May
Zone-4: May
Zone-5: May
Zone-6: April
Zone-7: April
Zone-8: March
Zone-9: March
PBI-Gordon Product Recommendations
