Answer: Citrus trees are not considered exceptionally fast-growing, so your tree can probably remain in the original one-gallon container for 2-3 years. Citrus tends to have lots of roots right at, or just below the soil surface, so don't let a network of visible roots on top of the soil be your guide as to when your tree needs repotting. Instead, look at the drainage holes in the bottom or around the sides at the bottom of the pot. When roots begin to escape through the drainage holes, it's time to repot the tree. It's always a good practice to replant into the next sized pot when it's time to repot rather than use an oversized pot. Be sure to use fresh potting soil when you transplant, and spread the roots out in a natural fashion to help your tree remain vigorous and healthy.
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