Mullein: Edible parts: Leaves and flowers. The flowers are fragrant and taste sweet, the leaves are not fragrant and taste slightly bitter. This plant is best known for a good cup of tea and can be consumed as a regular beverage. Containing vitamins B2, B5, B12, and D, choline, hesperidin, para amino benzoic acid, magnesium, and sulfur, but mullein tea is primarily valued as an effective treatment for coughs and lung disorders.