Corylus colurna is a deciduous Tree growing to 20 m (65ft) by 7 m (23ft) at a slow rate.It is hardy to zone (UK) 5. It is in flower from April to May, and the seeds ripen from September to October. The species is monoecious (individual flowers are either male or female, but both sexes can be found on the same plant) and is pollinated by Wind. The plant is self-fertile.