My gooseberry plants have stopped fruiting
I have 3 gooseberry plants on my allotment. They were originally in a shaded spot, and levels of fruiting went down over successive seasons, until I was getting only one or two gooseberries per plant. I thought lack of light was the issue, so 3 years' ago I moved them to a bright sunny spot, thinking that fruiting would be restored to normal levels. However, the opposite is true. For those 3 years the plants have flourished and grown but none of the them have even borne flowers, and consequently no fruit at all. I have mulched them, and tried fertilizers, both nitrogen-rich and phosphate-rich, but still no change. What can I do to kick-start them into fruiting? Or should I give them up as a lost cause, and dig them out?
Any comments/suggestions greatly appreciated!