Cosmos is native to scrub and meadow land in Mexico, where most of the species occur.
It's also widespread over the high eastern plains of South Africa
Yes, Cosmos is very pretty, i have it in my garden and it will die this winter, because it's far too cold overhere.
But its seeds are already in the ground and next spring it will grow again
Never heard of Cosmos plants.
(Perhaps because I live in the Northeast of North America )
I like the bokeh effect