Hazel is a shrub reaching 3–8 m tall, but can reach 15 m. The leaves are deciduous, rounded, 6–12 cm long and across, softly hairy on both surfaces, and with a double-serrate margin. Its natural habitat includes hedgerows, forest clearings and macchia. It is indigenous in Europe extending eastward to Caucasus. Flowering from March to April.
a. In Diseases of Women 2:
a. Is described as post treatment beneficial.
It is an important component of the hedgerows that were the traditional field boundaries in lowlands. The wood was traditionally grown as coppice, the poles cut being used for wattle-and-daub building and agricultural fencing. The leaves provide food for many moths and caterpillars. The fruit are even more important animal food, both for invertebrates adapted to circumvent the shell (usually by ovipositing in the female flowers, which also gives protection to the offspring) and for vertebrates which manage to crack them open (such as squirrels and corvids).