Hazelnut ‘Whiteheart’ produces small, round nuts that are primarily used for processing and provides good yields. The nuts ripen from red-orange to brown in late summer to early autumn. Pollinators for Hazelnut ‘Whiteheart’ include Hazelnut ‘Alexandra’, Hazelnut ‘Auckland No. 2’, and Hazelnut ‘Merveille de Bollwiller’. Hazelnut trees thrive in regions with mild summers and cool winters and require protection from wind and high temperatures in summer. The ideal temperature range is an annual average of 12°C to 16°C, with a maximum of 35°C to 36°C and a minimum of -8°C to -10°C. For optimal growth, annual rainfall should be evenly distributed throughout the growing season and range from 800mm to 1000mm. In areas that experience prolonged dry spells, particularly from late spring to mid-summer, and where the soil is free-draining (sandy or stony), irrigation will be necessary. Hazelnut is evergreen and native to Europe and western Asia. Learn more about Hazelnut. Hazelnut ‘Whiteheart’ was selected in the 1980s by Duncan & Davies Nurseries in New Plymouth, New Zealand.