Corylus colurna – Turkish Hazel (south-eastern Europe)
Habit: Medium tree with broad, conical habit, 12-15 (20) m tall, 6-8 m wide; straight leader, sometimes with round crown, branches vertically upright or horizontal, hardly lilting, 20-30 cm a year.
Flowers: Monoecious, yellow male flower catkins before leaves shoot; pistillate flowers, inconspicuous, March to April.
Fruits: Nuts in clusters in split covering leaves; from September, tasteless.
Leaves: Broadly oval, medium-green, golden yellow or only green-yellow from mid October.
Roots: Cordate roots, sensitive to soil compaction.
Demands: Robust tree, not demanding, sun, tolerates heat, frost hardy, tolerant of urban pollution, wind resistant.
Soil: On all neutral to very chalky soil; dry to fresh; moderately sensitive to salt.
Note: Slow-growing after planting, should be watered in the first years if there is a drought; withstands long dry spells well once it is established.
Hardiness: Zone 5b