A native Irish tree that is believed to be the Tree of Knowledge, Corylus Avellana is a large deciduous shrub or small tree with a bushy spreading habit. It has large, mid-green leaves which are broad and almost round. These turn yellow in autumn after the long male catkins appear in January and February. The female flowers on the same tree are tiny and must be pollinated by wind-blown pollen from another tree for fertilization.
Hazel is a tree that is especially valued for its wildlife and habitat conservation values. The plant also provides good foraging and cover for game and nuts are another important product. It grows tall so it does well in areas that get a lot of sunlight with poorer, drier soil.