Answer: Usually a lack of flowering is the result of a lack of light. Make sure nearby trees, buildings, etc. are not shading your tree. Also, make sure the tree is being properly pruned to allow light into the canopy of leaves.
Finally, remember that most fruit trees set their fruit buds in mid-late summer for the following spring's bloom. Pruning from early summer on will reduce the amount of buds that can be set for the next year. Summer stresses can also reduce bud set.
Good luck with your trees!
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