I am tying to figure out why a wheat beer that I added raspberries to turned out flat. I followed my standard procedure for priming sugar (4.6oz in this case), bottle conditioning, and capping (12oz bottles) – my other batches all turned out fine on carb. But every bottle of this 5 gal. batch is really undercarbed, many are entirely flat.
The only difference in production was adding 1.5lbs of raspberries to secondary a week or so before bottling.
Is there any reason that the raspberries could get in the way of carbonation in the bottle?