Local farmers market is selling my fav free natural medicine and it’s 240,000 seeds!

I just happened to spot the cutest fuzziest medicinal herb while I was at the market today!! It stood stunningly at 7 ft tall with its overflowing flowering stalk! After I asked the kind vendor about it, I was informed that mullein magically isn’t invasive because there are too many other invasives in the US for it to compete with c:
As I finished up my shopping, I heard her tell this kind old man to save the seeds of his own plant that his wife has been trying to remove so he could have a whole yard full of natural medicine!! Apparently we should also remove all cough meds from our life and exclusively use this medicine yayyy

/uj genuinely is it non destructive to allow mullein to reseed in mass quantities in Maine? I know it’s technically not invasive here but she was really insistent on it being noninvasive like everywhere in the United States and I know that’s not the case