When I make a yeast starter, I am used to seeing a big foamy krausen on top, complete with "braun hefe". But my last starter for my saison, made with WLP570, had absolutely zero foam, and now, after 24 hours, my fermenting beer (2.5 gallon batch) appears likewise -- it is obviously fermenting strongly, but there is no krausen. How could this be? I wonder if I screwed up the starter wort somehow, but I don't know how. I know the starter was fermenting strongly as indicated by the tiny bubbles rising that broke when they hit the surface, and I ended up with much more yeast on the bottom than I started with. And of course, all the spicy fruitiness in the aroma and flavor to go with it. But what gives? Is this normal perhaps for WLP570? Are there sufficient fusels being produced to entirely kill head retention? Is my final beer also going to have zero head retention, or will it be much different after fermentation is complete? In both the starter and in the fermenter, it is going at about 73 F, which I figure is fine for a saison. Finally, is there anything I can do after fermentation has started to perhaps improve head retention in my final beer? A saison with zero head just seems so wrong to me.