Black Haw 4 oz by Herb PharmWe prepare our Black Haw extract from the stem & root bark of Viburnum prunifolium trees which are Certified Organically Grown without the use of chemical fertilizers, pesticides or herbicides. To assure optimal extraction of Black Haw's bioactive compounds, the bark is hand harvested in the early spring, is carefully shade dried, and is then thoroughly extracted. These statements have not been evaluated by the Food and Drug Administration (FDA).