Widespread throughout the UK, where it is often found in the understory of oak, birch or ash woodland, hedgerows and scrubland.
Shiny with a toothed edge and hairy underside. They are round to oval in shape with a pointed tip. In the autumn they turn yellow before falling.
Male catkins are long and yellow, hanging in clusters in Spring. Female flowers are small and bud like, with a bright red tuft, or style. While male and female flowers grow on the same tree, pollination can only occur between different trees.
Hazelnuts, or cobnuts, develop from the female flower once pollination by wind has occured. Hazelnuts are encased in a woody shell and grow in clusters.