Good evening Mister Vulture, (you speak German, because of your nickname "Geier"?)
Edelweiß in vitro...now, that is a blasphemy! I have no clue about Edelweiß, some years ago someone (a manager of a job training centre) who wanted to grow them in his garden told me there are sometimes Edelweiß offered in garden centres and DIYs coming from mass propagation in Holland. They would be looking poor and would rather have a more grey flower colour than the natural shiny white. He finally found a special nursery which raised them from seed (I believe) where those plants were relatively expensive. But the manager was happy to grow robust plants with shiny white flowers.
I hope you don´t mean Edelweiß substances are good aphrodisiacs.... Excuse me for being cynical! There is this terrible prejudice Chinese would use everything rare and special as aphrodisiacs.
Friendly
Andreas