Answer: It is possible to prune your full sized tree to keep it within bounds. You can top it when it reaches 12' and maintain it at that height with annual pruning. You can also prune off one-third of the length of the branches to keep them within bounds. Pruning in this way will slightly reduce the amount of fruit your orange tree produces, but shouldn't harm the tree in any way. Repotting should be done as often as required, as indicated by roots escaping from the drainage holes in the pot and surface roots showing up above the soil level in the top of the pot. Hope this answers all your questions. Hope you have a bountiful harvest!
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