I'm trying to harvest some yeast from a bottle of Hacker Pschorr HefeWeizen. I stirred up the sediment from the bottom of the bottle and put it in a small starter (1 cup with yeast nutrients) 4 days ago and haven't see anything happen. This is my first time trying to harvest yeast from a bottle.
Has anyone harvested this yeast before?
I think I will check the gravity of the starter tonight and see if there has been any progress then maybe increase the size of the starter. Any other advice?