I have a Morello cherry, about 4 years old, which I’m growing as a cordon on a north-west facing fence. It makes prodigious growth, I prune about 75% each year. However it has so far produced half a dozen cherries. I’m guessing the soil is too fertile in that spot of the garden but I can’t move it elsewhere. I have a similar aged dessert cherry which is producing a reasonable amount of fruit. Is there any way I can encourage more fruit and less growth?