aftr much discussion here, I planted a Northland blueberry bush in a
pot. It has produced lots of flowers, but none have resulted in fruit -
they are starting to go brown and drop off. It is too early for the bees
etc to be out of their beds doing their work, or could it be that the
pot it right next to another which has loads of mint in it ? Could the
scent be keeping the bees ect away ?

(I know its recommended to have two species of blueberry bush near each
other for cross polination - but I dont have room. I have been assured
that one bush should be more than capable of producing lots of fruit)