Southern deciduous forest zone, also known as the nemoral region, the southern deciduous forest zone is a part of a larger vegetation zone which also includes Denmark and large parts of Central Europe. It has to a rather large degree become agricultural areas, but larger and smaller forests still exist. The region is characterised by a large wealth of trees and shrubs. The beech are the most dominant tree, but oak can also form smaller forests. elm at one time formed forests, but have been heavily reduced due to Dutch Elm disease. Other important trees and shrubs in this zone include hornbeam, elder, hazel, fly honeysuckle, linden (lime), spindle, yew, alder buckthorn, blackthorn, aspen, European rowan, Swedish whitebeam, juniper, European holly, ivy, dogwood, goat willow, larch, bird cherry, wild cherry, maple, ash, alder along creeks, and in sandy soil birch compete with pine. Spruce is not native but between approximately 1870 and 1980, large areas were planted with it. They tend to grow too quickly due to being outside of their native range and large distances between the tree rings cause poor board quality. Later some spruce trees began to die before reaching optimal height, and many more of the coniferous trees were uprooted during cyclones. During the last 40–50 years large areas of former spruce plantings have been replanted with deciduous forest.