Oak:
Search for Quercus robur, petraea, or pubescens in
the open cadaster/registry. You probably want to contact Grün Zürich (see bottom of the page) if you need more than a couple handfull.
For the rest I'd contact landwirtschaftmitzukunft.ch and ask for advice/directions.
Keep in mind that "Bio" allows the use of poisons, it bans synthetic poisons only.