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The American hazelnut grows to a height of roughly 2.5 to 5 m (8 to 16 ft), [6] with a crown spread of 3 to 4.5 m (10 to 15 ft). It is a medium to large shrub, which under some conditions can take the like of a small tree. It is often multi-stemmed with long outward growing branches that form a dense spreading or spherical shape.
It is very tolerant of difficult growing conditions in urban situations, which in recent decades has increased its popularity in civic planting schemes. Turkish hazel makes a good shade tree since it produces very dense shade, and its narrow crown and ability to withstand air-pollution make it well suited for use as a street tree in urban areas.
Corylus avellana, the common hazel, is a species of flowering plant in the birch family Betulaceae. The shrubs usually grow 3–8 metres (10–26 feet) tall. The nut is round, in contrast to the longer filbert nut. Common hazel is native to Europe and Western Asia. The species is mainly cultivated for its nuts.
Corylus jacquemontii trees are also fairly wind tolerant, [48] [6] and like other members of this genus, they can withstand transplanting well and they can be easily moved even when relatively large trees. [6] They are cold hardy to USDA Hardiness Zone 5 (−20 °F to −10 °F). [6] The trees could be used within gardens as an ornamental shade ...
The first mention of a shift to using the term hazelnut published on the newspaper's food page in 1975. A recipe suggested substituting chopped filberts, "now being marketed under the name hazelnuts."
Corylus cornuta var. californica – Western beaked hazel or California hazelnut. Large shrub, 4 to 15 m (13 to 49 ft) tall; [ 7 ] 'beak' shorter, usually less than 3 cm ( 1 + 1 ⁄ 4 in). Occurs below 2,100 m (6,900 ft) in California , and below 800 m (2,600 ft) in British Columbia .