GROW: Mullein seeds germinate best when exposed to a period of cold, moist conditions (cold stratification). Direct sow mullein seed outdoors in Autumn where they will germinate the following spring. Seed can also be started indoors in spring 6 weeks before the last frost.
HARVEST: Leaves can be harvested by hand at any time, preferably in the late spring or early summer when in bloom. For the largest crop, harvest leaves in the Autumn of the first year or the spring of the second year, because quality deteriorates after that.
USE: Flowers, leaves and root, fresh or dried. Most of the market seems to be for leaves