The flowers are the most attractive feature of summersweet clethra. Flowering mid-summer after most other woody shrubs have bloomed, they attract bees, butterflies and hummingbirds. The highly fragrant white (sometimes slightly pink depending on cultivar) flowers are borne on upright 4-6 inch racemes. They bloom bottom to top contributing to a long lasting flowering period of 4-6 weeks.
Karren Wcisel, TreeTopics.com
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Clethra alnifolia, summersweet, clethra, sweet pepperbush, deciduous, shrub, flowering shrub, summer flowering shrub