Preferred common name: Grey alder
Other common names: Gray alder, American black alder, common black alder, hoary-leaved alder, speckled alder
 RHS Grey Alder (Alnus incana) is a species of alder with a wide range across the cooler parts of the Northern Hemisphere.
RHS Grey Alder (Alnus incana) is a small to medium size tree 15-20 m tall with smooth grey bark even in old age, its life span being a maximum of 60-100 years. The leaves are matt green, ovoid, 5-11 cm long and 4-8 cm broad. The flowers are catkins, appearing early in spring before the leaves emerge, the male catkins pendulous and 5-10 cm long, the female catkins 1.5 cm long and 1 cm broad when mature in late autumn. The seeds are small, 1-2 mm long, and light brown with a narrow encircling wing.
RHS Grey Alder (Alnus incana) has a shallow root system, and is marked not only by vigorous production of stump suckers, but also by root suckers, especially in the northern parts of its range.
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