Field Bindweed (Convolvulus arvensis)

Field bindweed is a member of the Morning-glory family. This creeping perennial was introduced from Europe. It reproduces by seed and horizontal roots. The stems are 1 to 4 feet long and spread thickly over the ground or wind around erect plants or other objects. The flowers are bell- or trumpet-shaped, white or pink. Field bindweed is one of the most competitive perennial weeds and is a problem throughout Colorado. Its roots can extend 10 feet deep and a two- or three-year food supply is stored in the extensive underground root system. This makes it hard to kill by cultivation because roots will live as long as their food reserve lasts. Seeds can also stay viable in the soil for up to 40 years. 

Comments: Control by means other than herbicides is difficult. It is best to eliminate young bindweed plants before they have a chance to develop their extensive root system. The biggest threat posed by field bindweed in Pitkin County is to hay producers who are trying to have their hay certified as weed-free.

Biological controls: None currently available.

Chemical controls: For additional information contact your local city, county or town natural resource office. (See section VII for phone numbers.)

Cultural controls: Re-seed disturbed areas adjacent to field bindweed infestations with native perennial sod-forming grasses such as Western wheatgrass.

Mechanical controls: None available.

Locations of Infestations of Field Bindweed on Roads and Open Space in Pitkin County: