I'v been giving three apple trees about 1.5-2 inches dia. And about 8 ft. tall.providing they survive the transplanting in the spring,how long will it take before they start producing fruit.

Three to five years... If you prune them properly.

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Training and Pruning Apple Trees_U.Cornell Cooperation Ext (http://eap.mcgill.ca/CPTFP_7.htm)