Common name: Caucasian Wing Nut.
Native: Caucasus and Northern Iran.
Size and spread (10 years): 10m
Treatment required: Deeply dormant requires 29 weeks stratification treatment.
Seeds / kg: c.17,000
Ideal sowing period: Spring
Soil conditions: Moist loamy soils.
Planting instructions: Grows well where winters are mild and summers not too hot. There is a very fine example at Sizergh Castle, in the Lake District.
Mature height: 25m+