Moth mullein (Verbascum blattaria) grows throughout the United States and Canada and is typically seen in pastures, open fields and meadows. It is a biennial plant that produces a basal rosette the first year and a beautiful flowering stalk the second. Moth mullein grows wild and it can be grown from seeds in home gardens. In order to reap a garden full of flowers, you may need to protect--or winterize--your moth mulleins. The simple process can make all the difference in giving first-year plants the best chance of surviving into the next year, when they will bloom.
Wait until the fall to begin protecting your moth mullein for the winter months. Just before the first frost is ideal.
Add 2 to 3 inches of organic mulch, such as wood chips or bark, around the base of the plant.
Keep the mulch about 1/2 to 1 inch from the crown of the plant. The crown is the part of the stem where the roots meet and is typically right at soil level.