[1] It has large, arrow-shaped leaves and showy white trumpet-shaped flowers up to 9 centimeters in diameter.

Large bindweed is a glabrous herbaceous perennial that twines in a counter-clockwise direction to a height of up to 5 m. The leaves are arranged alternately on the spiralling stem on petioles up to 15 cm.

[2] The flowers are white, sometimes narrowly pink on the outside only, produced from late spring to the end of summer (between July and September in northern Europe).

The buds are enclosed by large (4.8 cm long), ovate, green bracteoles pouched at the base; during anthesis they strongly overlap.

It is 1 cm in diameter, containing two to four large, dark brown or black seeds that are shaped like quartered oranges.