I have a 3 year old blueberry bush (bluecrop) and 2 new bushes that I bought a couple of months back. All are in similar size pots, in ericaceous compost. It's very noticeable that the old blueberry has far fewer flowers than the new ones - maybe about a third the amount.

What I'm wondering is if this is just how things are and they produce less as they get older, or if there's something I should/shouldn't do to help the old one and stop the new ones going the same way!!