Hardiness: USDA Zone 5a: to -28.8 °C (-20 °F) USDA Zone 5b: to -26.1 °C (-15 °F) USDA Zone 6a: to -23.3 °C (-10 °F) USDA Zone 6b: to -20.5 °C (-5 °F) USDA Zone 7a: to -17.7 °C (0 °F) USDA Zone 7b: to -14.9 °C (5 °F) USDA Zone 8a: to -12.2 °C (10 °F) USDA Zone 8b: to -9.4 °C (15 °F) USDA Zone 9a: to -6.6 °C (20 °F) USDA Zone 9b: to -3.8 °C (25 °F)
Propagation Methods: By dividing the rootball From seed; winter sow in vented containers, coldframe or unheated greenhouse From seed; sow indoors before last frost From seed; direct sow after last frost
Seed Collecting: Allow seedheads to dry on plants; remove and collect seeds Properly cleaned, seed can be successfully stored
On Aug 5, 2011, Emma60 from Grassy Creek, NC (Zone 6a) wrote:
I have grown this mullein for about 10 years, and I absolutely love everything about it - the foliage, the flowers, the architecture. It is one of my favorite perennials, and every year I go out and scout for seedlings because I want more, but after 10 years, I only have about five extra plants, so it has not been invasive in my garden at all. In fact, I have recently sown some seeds so I can have more - many more. It's a keeper if there ever was one.
On Sep 20, 2009, jrtinker from Palmer, AK (Zone 3b) wrote:
This plant is highly architectural, and unlike most of it's relatives, is a very hardy perennial. It has been surviving to USDA Zone 2, and is a prolific self-sower. The way all Verbascums flower, there are still new buds opening when the first buds that bloomed are going to seed. This plant must be deadheaded religiously or it will take over a garden bed. I am in the process of removing it from my garden. The yellow flowered form is equally invasive. They are pretty, but I prefer the biennial varieties, or the well behaved Verbascum phoeniceum.
On Aug 31, 2007, macybee from Deer Park, TX (Zone 9a) wrote:
This genus consists of semi-evergreen to evergreen perennials, biennials and shrubs from Europe and the more temperate zones of Asia. Including some very large and some very coarse species, the genus offers much variety in the foliage with leaves ranging from glossy to velvety. They develop large, often complex, basal rosettes. Many of the 250 or so species are scarcely better than weeds. However, several are desirable in the garden for their stately habit, gray foliage and long summer-flowering season-the flowers do not open from the bottom up as, for example, delphiniums or foxgloves do, gut a few at a time along the spike.
CULTAVATION: These plants are fully to moderately frost hardy but will not tolerate winter-wet conditions. Establish all species in well-drained soil and an open, sunny location, although they do tolerate shade. Propagate from seed in spring or late summer or by division in winter. Some species self-seed readily.
This species from southern Europe can be relied on to live long enough to form clumps. The flowers, borne on 3' tall stems in summer, are normally yellow. The white form 'Album' is usually finer.
This plant has been said to grow in the following regions:
Wasilla, Alaska Fairfield, California Richmond, California Helena, Montana Roswell, New Mexico Grassy Creek, North Carolina Oklahoma City, Oklahoma