Common Hazel: Edible Plant

What Is Common Hazel and Where Does It Come From?

Common Hazel (Corylus avellana) is a deciduous shrub or small tree native to Europe and Western Asia, from the British Isles to the Caucasus and Turkey. It typically reaches a height of 3–6 meters with a broad, multi-stemmed growth habit, forming dense thickets and hedgerows. The leaves are round to oval with doubly serrated margins and a characteristic rough texture; in autumn, they turn golden yellow. The female flowers are remarkably discreet – only the bright red stigmas are visible from the closed buds – while the male catkins hang in long, yellowish-green clusters and are a sure sign of early spring. The hazel is one of the earliest spring shrubs in the Northern European landscape. It flowers as early as January to April, before the leaves emerge, and is pollinated exclusively by wind. Its fruits are the well-known hazelnuts, which ripen in clusters with a cup-shaped involucre in September–October. The nuts are rich in fat (up to 60%), protein, and vitamin E, and have been an important food source for humans in Europe since the Stone Age. Hazel grows at forest edges, in hedgerows, scrublands, and along watercourses, and is a key species for biodiversity: its early pollen is crucial for bees, and it hosts the larvae of over 70 butterfly and moth species. The shrub is extremely hardy and adaptable; it thrives in almost all soil types, from sandy soil to clay, and from sea level to the mountains. It spreads naturally via suckers and can be effectively rejuvenated by coppicing – a traditional management method that both extends the shrub's lifespan and produces flexible, pliable wood suitable for weaving (hazel rods). In Denmark, hazel is a characteristic element of oak forests and scrublands throughout the country.