From today 11.4. till Sunday 13.4. you can buy rare plants from various stalls in the botanical garden of Vienna from 9:30 till 6pm.
Definitely worth a visit to check out those plants, the botanical garden itself and some of the food stalls selling marmalade, wine, etc.
I myself had to bring two chili plants home again and am planing to go back and maybe buy a bonsai with the approval of the mister
so we can share costs.
You can find more details here.