Peter
I think the reason they flood the crop is so that the fruits are easier to get off the bushes ..... I'm not sure I'd go to those lengths
Once the berries are a nice dark red (usually end of September in the UK I would think) they are ready and the beauty of them is that you can freeze them straight away and use them as and when. I don't grow them, but I buy them fresh (when the hard work's been done
) and then open freeze them to keep them separate, put them in a large bag then I can just pour out as many as needed.