Mullein has a long history of herbal use.

Succeeds in most well-drained soils, including dry ones, preferring a sunny position. Dislikes shade and wet soils. Thrives on chalk. Prefers a light soil.

Plants are hardy to about -20°c.

Sow late spring to early summer in a cold frame and only just cover the seed. Germination usually takes place within 2 - 3 weeks. When they are large enough to handle, prick out the seedlings into individual pots and plant them out in late summer. 

http://practicalplants.org/wiki/Verbascum_densiflorum