Answer: If your apple tree is flowering but not producing fruit, it is due to lack of pollination from poor insect activity, or lack of a suitable companion apple tree. Some apple trees are considered self-fruitful and you need only one tree, but most are considered unself-fruitful and rely on a different apple variety to provide cross pollination. Even self-fruitful trees will produce heavier crops if there is another apple tree in the vicinity. If your apple tree is not flowering or is barely flowering, it is either too immature to produce much fruit, or it is not getting all day sunshine, or it has been poorly pruned. An immature tree will eventually produce fruit so nothing needs to be done. I would not prune the tree at this time. Check it in the spring and count to see how many flowers it produces. If there are a lot of flowers but few fruits, you may need to plant a second apple variety to get a good crop. If there are few flowers, your tree just needs to mature more or it needs more sunshine.
Hope this helps you figure out what's going on with your tree!
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