crack willow References Contents crack willow plant Ask Anything Also known as: Salix fragilis, brittle willow Britannica AI Ask Anything Learn about this topic in these articles:description In willownigra), crack, or brittle (S. fragilis), and white (S. alba), all reaching 20 metres (65 feet) or more; the first named is North American, the other two Eurasian but naturalized widely. All are common in lowland situations.Read More