I'm not sure if twiggy mullein had the same properties as common mullein... they definitely look rather different. Common mullein has a lot of
medicinal attributes and it's used for respiratory issues especially. It can also be used as the base of herbal smoking blends, if one happens to partake. But I do encourage it to grow especially for use as chop and drop. Twiggy mullein is certainly worth a bit of research. If it's half as useful as common mullein, then it's a very useful plant indeed.