Turkish hazel

Turkish hazel (Corylus colurnoides), also known as the tree hazel, is a prominent member of the Betulaceae family. Unlike the common shrub-like hazelnut species, this plant grows as a stately tree with a single, sturdy trunk, making it a highly valued specimen for both commercial nut production and forestry applications.

Originating from the mountainous regions of Southeastern Europe and Western Asia, this species thrives in temperate climates. It is typically found in mixed broadleaved forests where it demonstrates a strong ability to adapt to diverse ecological conditions, provided there is adequate drainage and deep soil depth for its expansive root system.

Botanically, the Turkish hazel is characterized by its corky, flaky bark and distinctive large, serrated leaves. The nuts are produced in clusters, encased in a leafy husk that is often deeply lobed or fringed. The tree is known for its longevity and its ability to withstand colder winters, which allows it to be cultivated in regions where other nut-bearing trees might struggle.

Agronomic requirements center on well-drained, nutrient-rich soils with a neutral pH. The tree is relatively low-maintenance once established, but it benefits significantly from supplemental irrigation during the dry summer months to ensure optimal nut filling. Proper spacing is essential to allow for crown development and to facilitate air circulation, which reduces the risk of fungal infections.

The economic value of this species is multifaceted:

• It serves as an excellent rootstock for commercial filbert cultivars, preventing suckering.
• The nuts are highly prized for their taste and nutritional density.
• The timber is durable and attractive, often used in fine woodworking and furniture making.
• It serves as an excellent shade tree in urban planning and windbreaks.

Regarding plant health, the species is susceptible to the hazelnut weevil, which can damage the kernel if left uncontrolled. Furthermore, bacterial blight can pose a challenge in damp climates, necessitating careful orchard hygiene, including the removal of dead or diseased wood and the maintenance of optimal planting density to prevent the spread of pathogens.