Blueberries

[lindylou1]

Hi Folks, this is my first post on this forum and I'm hoping that someone may be able to answer a couple of queries, the first one about blueberries. I have had 4 bushes for a number of years, don't remember the varieties but 2 produce loads of fruit but the other two don't and they don't seem to grow very well. They send up straight stems which just about look like the original leaves but they haven't formed any branches and haven't produced any fruit?? Any suggestions appreciated.

[lindylou1]