My wife likes Sea Dog's Blueberry and rasberry wheat beers and she asked me to make one. Now I have made wheat beers before so I am good on that part, but when do I add the fruit....boil? secondary? I hope to make it next weekend.
For best results put half of your fruit in the primary and half in your secondary. I find that heating the fruit in water to 180 F for ten minutes will sterilize the fruit without setting the pectin or cooking off the flavor. It also makes the fruit easy to pour into the carboy. I find that the best flavor comes from about 3 pounds frozen fruit each time and two weeks in the secondary on the fruit.
I just bottled a raspberry hef wherein I added the fruit to the secondary. There was a lot of headspace, but it still shot a grip of foam through the airlock and overflowed. Not that that's bad...
after a week in the secondary and about 5 days in the bottle, it has lots of fruit flavor.