IdahoHerbalist wrote: Mullein is a biennial so harvest end of first year (for largest root) or beginning of second year BEFORE the flower stalk starts.
This is true from the root (useful for bladder incontinence and back issues).
For the leaf (useful for respiratory stuff, worms and gland support) any time as long as the look vibrant and happy.
For the flower…wait for it…when it’s flowering. :0)
Doc
Don't use herbs or combine herbs with medications or use them during lactation or pregnancy without talking with your healthcare provider.