Turkish Filbert

Turkish Filbert is Corylus colurna, a large deciduous hazelnut tree with an oval to pyramidal crown. The Morton Arboretum lists mature dimensions of 40–50 feet tall and 15–35 feet wide, while Kew classifies the species in Betulaceae and places its native range from southeastern Europe to northern Iran. ## Landscape Use This tree makes a long-lived shade or specimen planting where there is room for a broad crown and fallen nuts. The edible filberts develop inside distinctive frilly husks. The Morton Arboretum also notes inconspicuous hanging male catkins, tiny pink female flowers, and yellow fall color. [Morton Arboretum’s Turkish hazelnut profile](https://mortonarb.org/plant-and-protect/trees-and-plants/turkish-hazelnut/) provides mature size, form, flowers, and fruit details; [Kew’s Corylus colurna record](https://powo.science.kew.org/taxon/295453-1) confirms the species and family. ## Growing Conditions Morton Arboretum recommends full sun or partial shade and moist, well-drained soil. It lists tolerance of clay and alkaline soil, dry sites, and occasional drought once established. The Morton Arboretum lists hardiness zones 4–7; confirm local conditions when planting near the range edges. ## Maintenance Watch for basal suckers and remove them if they interfere with the intended trunk form. Keep the mature spread in mind when locating paths, structures, and other trees. Its broad crown needs clearance from paths, structures, and neighboring trees.