I am smitten with this white-flowering
perennial Mullein, Verbascum chaixii album.  Its spires are jam packed, from top to bottom, with small flowers the color of fresh cream with centers of orange and purple.   Just as much as the profusion of flowers on this attractive
hardy perennial Mullein, I like its large, textured rosettes of foliage, not to mention the architectural aspect it lends to my garden.  I have heard some call Verbascum invasive, but for as many years as I have grown it, I only have four or five extras from reseeding - just not enough, if you ask me.  This Mullein is easy
to please, and if you cut it back after each blooming, it will send up new spires and will re-bloom.  Growing from two to four feet, Verbascum chaixii album prefers sun and well-drained soil in Zones 5-10.  Quarts.

I am partial to all Verbascum (Mullein), particularly Verbascum phoeniceum "Violetta," because the blooms are a lovely shade of violet/purple, and this perennial Mullein couldn't be easier to grow.  "Violetta" isn't a bit fussy about water; it's deer and snail proof; it's agreeable to sun or bright shade; and it blooms from late spring through early summer.  The flowers of Verbascum "Violetta" begin opening at the bottom of the stem and work their way up, and if cut back, it is a repeat bloomer, but you will want to let some seeds develop for re-seeding.  As with most Mullein varieties, the dark green foliage is also an asset, forming attractive, flat rosettes.  This stunning Verbascum grows to about 30 inches in Zones 5-10.  Quarts.