Mullein is one of the ingredients for healing mastitis. Mix it with Lobelia and echinacea equal parts by weight in a tea. I would love to try in on a cow or goat sometime. I know several women it worked great for.
Really true. That was one of the reasons that the Europeans brought them to the New World.
They got rid of 'bad' fish, so they could restock with 'good' fish.
Mullein seeds have a very high level of rotenone. It paralyses the fish.
Not a good choice around your pond if you are trying to raise fish.
EDITED to add: As a fish poison, the seeds were normally ground up (to release more of the toxin quickly). I don't know if whole seeds would work as quickly, or as well. I have no intention of experimenting.
See, that's why I come to permies - I learn something new every day. This is probably why our chinese medicine doctor told us to go easy on the mullein tea.