Editing Corylus americana (section)

== Description ==

American hazelnut is usually a low to medium-sized, many-stemmed shrub. Accounts describe plants from about 1–3 m in natural settings and cultivated shrubs that can reach roughly 3–5 m, with size influenced by site and management.<sup id="cite_ref-3">[[#cite_note-3|[3]]]</sup> Woody rhizomes commonly occur several inches below the soil surface and produce shoots some distance from the parent; the shallow root system is concentrated in the upper soil layer.<sup id="cite_ref-4">[[#cite_note-4|[4]]]</sup> This combination gives established plants resilience and regenerative capacity, but it can also make an old clump difficult to confine.

The plant is monoecious: male catkins and female flowers occur on the same shrub. Pollination is by wind, and compatible pollen from more than one plant is needed for dependable nut production because hazelnuts are self-incompatible.<sup id="cite_ref-5">[[#cite_note-5|[5]]]</sup>