Ostrya carpinifolia – Hop Hornbeam (southern Europe, western Asia)
Habit: Medium-size tree, 10-15 m tall, 8-12 m wide; initially conical to ovoid, gradually with round crown; loose, slow-growing, 20-40 cm a year.
Flowers: Monoecious, green females, yellow male catkins, some 10 cm long, hanging loosely, before or while leaves shoot; end of March to May.
Fruits: Syncarpy like hops, brownish orange, like cones.
Leaves: Like the common hornbeam, elliptical, pale green, light yellow in autumn, end of September.
Demands: Sunny to slightly shady; likes warmth, frost hardy; tolerant of urban pollution.
Soil: Dry to fresh, moderately acidic to alkaline; all nutritious garden soil, best when well drained, not growing well on heavy soil.
Hardiness: Zone 6b