The black willow is native, and the weeping and crack willows were originally foreign, or exotic. On favorable sites, some trees are often 35 to 50 feet high, with a diameter of 6 to 25 inches.
Seeds are minute, maturing in late spring or early summer.
Range Many varieties occur over a wide range in Wisconsin and the United States from moist conditions to dry upland prairies. Many European and ornamental varieties have been introduced.