Alder cones vary in size depending on the species of alder.
Common alder (Alnus glutinosa) cones are typically small, about 2-4 cm (0.8-1.6 inches) long and 1-2 cm (0.4-0.8 inches) wide.
Black alder (Alnus glutinosa) cones are slightly larger, measuring 3-6 cm (1.2-2.4 inches) long and 1.5-2.5 cm (0.6-1 inch) wide.
Red alder (Alnus rubra) cones are larger still, measuring 3-8 cm (1.2-3.1 inches) long and 2-3.5 cm (0.8-1.4 inches) wide.
It’s worth noting that alder trees are members of the birch family, and their cones are often referred to as “catkins” rather than cones. The size and shape of alder cones can also vary depending on whether they are male or female cones.
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