A vegetation type dominated by shrubs and saplings, whose abundance varies from scattered to closed-canopy, usually less than 5m tall but sometimes with scattered trees. The definition excludes heathland with dwarf shrubs, planted stands of young trees and coppice regrowth. The National vegetation classification recognizes six kinds of scrub, two of which are underscrub. The nature conservation value of scrub is poorly recognized. It forms a significant component of eleven priority habitats.