Field bindweed is a List C vining perennial in the morning glory family (Convolvulaceae).
Known to be in North America since the 1700s and in Colorado since 1872, it was introduced as a contaminant of seed. It can now be found in all 50 states. It is a native to Eurasia and Asia and naturalized in many other areas.
It has a thick taproot that can grow to 20-30 feet deep and multiple horizontal rhizomes with buds that form new plants. Plants can easily regrow from root fragments. The root mass can reach 2½ to 5 tons per acre.
The trumpet shaped flowers form in the leaf axis. Flowers form from late spring until frost. The 1-inch-wide flowers are white to pink and have two small bracts that form ½ to 2 inches below the flower.
Each flower produces a roundish fruit that contains 2 to 4 seeds. The seeds can stay viable in the soil for 20+ years.
Field bindweed stems are 5+ feet long. They are twisted and are either prostrate or can climb and cover other plants, fences, and structures.
The 2-inch long and 1-inch-wide leaves are alternate, simple and arrow shaped, smaller towards the ends of the stems.
A serious pest in wheat and bean crops, it also invades vineyards, orchards, degraded rangelands, landscaped areas, and lawns. Field bindweed can harbor plant diseases (potato X disease, tomato spotted wilt, and vaccinium false bottom).
Control using cultural techniques and/or systemic herbicides. It requires persistent efforts over multiple years. The bindweed gall mite, Aceria malherbae has shown some good success in areas that are grazed or mowed.
Pacific Northwest Extension – Field bindweed (PDF)
National Park Service https://www.nps.gov/articles/field-bindweed.htm
Washington State University https://smallgrains.wsu.edu/weed-resources/common-weed-list/field-bindweed/