Apple trees reach fruiting maturity between two and 10 years of age depending on the variety and growing conditions. When apple trees reach this mature age and still fail to bloom or produce fruit either cultural practices, lack of pollination or stress from battling disease or insects is likely to blame. Creating ideal growing conditions is the most important factor in spurring apple trees into bloom.
Grow your apple trees in a location with a full, daily direct sun exposure. Remove or prune back any trees that are shading the apple tree.
Plant apples on high ground where frost will not pool around the tree. Maintain evenly moist and well drained soil so that the roots are never sitting in soggy soil.
Remove competitive weeds or under plantings from at least the immediate four feet under and around the apple tree. This will reduce the stress for water and soil nutrients.
Fertilize your apple trees in the late winter or early spring with a complete slow release fertilizer with a guaranteed analysis of 10-10-10. Feed one pound of fertilizer for every year of growth up to a maximum of six pounds for each mature tree. Spread the fertilizer in a wide doughnut formation starting at least 6-inches away from the trunk and extending at least 6-inches beyond the drip-line of the tree canopy.
Inspect your apple tree regularly for sign of insect damage or disease. Prevent the most common problems with annual spraying in the early spring with a fungicide and an insecticide designed for use on apples. Additionally, spray with horticultural oil to control scale, mites and aphids. Apply each according to the product label directions.
Prune away any damaged or diseased or dead wood you find placing the cut down at the point of healthy wood. Refrain from any other pruning while trying to establish or re-establish the blooming and fruiting cycle.