I have a whole tray of Mugwort to plant -- where should I put it? I know
it grows tall and that's not a problem, but I sometimes let my horses near
my gardens -- is it a problem that they might eat it?

Part shade? All sun? East, West, South or North? Any recommendations?
There's nowhere I can plant it that I don't really care if it takes over
but what will be the best place for it?

My soil is mostly Indiana clay. Zone 5.