Korean Spice Viburnum is widely considered one of the most fragrant shrubs available for temperate gardens. It produces a powerful, spicy-sweet fragrance—reminiscent of cloves and vanilla—that can carry across an entire yard. In early spring, pink buds open into dense, waxy clusters of white or blush-pink flowers. The leaves are dull green and slightly fuzzy, often turning a beautiful burgundy or deep red in the autumn.