Answer: It sounds like a 5-gallon squat pot. Unless your bougainvillea has roots coming out the drainage holes, it probably doesn't need repotting immediately. If you'd like to put it in a decorative pot, simply set the nursery pot in the decorative pot and place spaghnum moss over the top. When it's time to repot, go to the next sized pot (7-gallon) and use fresh potting soil. Bougainvilleas resent having their roots disturbed so when you repot, try not to move the roots around too much.
Best wishes with your bougainvillea!
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