A new variety of Alnus maritima subsp. oklahomensis plant named ‘September Sun’ that is characterized by fast vertical growth of ≈89 cm (35 inches) per year over the first two years after establishment in the landscape and fast canopy volume growth of ≈4.8 m3 (170 cubic feet) during the second year after establishment. The strobili (infructescences) of ‘September Sun’ are small (17 mm long and 10.2 mm wide) and slender (length:width ratio=1.7) compared to the average for oklahomensis. In combination, these traits set ‘September Sun’ apart from all other existing varieties of Alnus maritima subsp. oklahomensis known to the inventors.
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