There is only one species of mullein used in herbal medicine in north america and it came from europe, Verbascum thapsus. Worldwide there are actually 360 species of mullein.
Special note: The leaves contain coumarin which is used to make warfarin. If you are already taking blood thinners use special care with the leaves.
Warnings aside… mullein has a host of uses, every part but the seeds can be used.
A tincture made from the root is excellent for incontinence in the elderly and new mothers, my elderly dad uses it from time to time. It’s also been known to help some prostate issues.
The leaves… the list of uses is almost endless. Let’s start with a little-known use. The leaves as a poultice speed the healing of broken bones, just like comfrey. As an extra benefit it eases nerve pain from broken bones and wounds especially if you pour a little flower tincture on to the poultice.
It’s particularly good with difficult to set bones like badly broken ribs. Just put on a leaf poultice and rest for a couple of days… It also eases the nerve pain from dislocated limbs like a shoulder or a badly sprained ankle. It has a special affinity for bulging or herniated disks in the spine, just apply the poultice to the spine and rest for a couple days… no more herniated disk.
The list for respiratory issues takes up an entire chapter of a book I have. I not going to begin to write them here.
Another little oddity… the plant is a biennial. The first year you only see the rosette, before it puts up the stalk… leaves from the center of the rosette, AND only the center, made into a tea makes a very good sleep aid… Leaves from the outer edge of the rosette work as a sleep aid also but cause horrible nightmares in a large portion of the population! Hey! Want to scare the crap out of your kid on Halloween night? Just kidding!