Boskoop (Hamamelis ‘Boskoop’) Posted on April 11, 2012 by Lucile Whitman Boskoop (Hamamelis 'Boskoop') Boskoop may be the oldest Hamamelis in production. Flowers are butter yellow and fragrant. Late winter flowering. Light red flowers appear in January. Lightly fragrant. Size: Field grown Price: $115.00 Size: 1 gallon Price: $30.00