The flowers of Hamamelis vernalis bloom prior to the leaves emerging. Bloom time is generally January through March. The flowers have the ability to roll back up if the weather gets too cold and unfurl again when the weather is more favorable. This protective adaptation is present in both species of Hamamelis.
Karren Wcisel, TreeTopics.com
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Hamamelidaceae, Hamamelis vernalis, vernal witchhazel, witch hazel, shrub, deciduous