Originally Posted by Irrenarzt
This is true but he said it was already fermented. If he used a saison yeast, it's probably already attenuated down pretty low already. I've had saisons that ended at 1.004 without brett. 3711 is an animal of a yeast, as are most saison yeasts. I imagine there won't be much left for anything to eat at 1.004.
It depends but you do have a point.
That will depend on the composition of sugars in the wort. Brett will eat dextrinous wort that sacch won't. If you mash for medium to med-high body, you could get decent brett character from finishing with brett with no added sugar.
Otherwise, adding maltodextrin like emjay said will feed it.