winter hazel with Korean azalea One of the most spectacular plant combinations in the Winterthur Garden is near its peak; the Winter Hazel Walk is a collage in shades of purple and pale yellow. The Walk combines the butter yellow of winter hazel (Corylopsis spp.) with the pink to purple flowers of the Korean azalea (Rhododendron mucronulatum). Hellebores, evergreens, and shrubs like the cherry prinsepia (Prinsepia sinensis), play supporting roles. A visit in the morning or evening is a perfect time to enjoy the azaleas backlit against thousands of winter hazel blossoms. More information about the garden and a bloom calendar.