Japanese honeysuckle is an extremely vigorous twining and trailing woody vine that can grow more than 30 ft (9.1 m) in length. The leaves are in pairs opposite each other along the stem and are deciduous in cold climates, evergreen in milder areas. They are elliptic to oval, 2-3 in (5-7.6 in) long and half as wide. The flowers are about an i1.5 in (2.8 cm) long, tubular with two widely spreading lips, and borne in pairs. Japanese honeysuckle blooms throughout the entire growing season. The flowers start out white, sometimes tinged with purple, and age to yellow in their second day. They are extremely fragrant. The fruits are blue-black berries about 0.25 in (0.6 cm) in diameter.