Producing Fruit on orange and lemon trees
I live in England. Both my orange and lime tree's have not produced any fruits since I got it ~2.5 years ago. They did have fruits in the shop when I first bought it.
Both plants flower and look like they produce the very small beginning of a fruit but they all fall off after the flowers die. What are the likely causes of this and what can I do to improve the chance of growing fruits?
Also how often do lime and orange trees fruit each year? Is it just once or...?