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Field Bindweed (Convolvulus arvensis )
Field bindweed is a member of the Morningglory family. This creeping perennial was introduced from Europe. It reproduces by seeds and horizontal roots. The stems are smooth, slender, slightly angled, 1 to 4 feet long, and spread thickly over the ground or wind around erect plants or other objects. The leaves are alternate, 1 to 2 inches long, with great variation in shape. They are somewhat arrow-shaped with spreading, pointed, or blunt lobes at the base. The flowers are bell or trumpet-shaped, white, pink, or variegated, and about 3/4 to 1 inch broad.
Field bindweed is a problem throughout Colorado. It is one of the most competitive perennial weeds. 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. It is widespread in cultivated areas, pastures, lawns, gardens, roadsides, and waste areas throughout Colorado from 4,000 to 8,000 feet.