Answer: Repotting is done to allow more room for the roots when the roots have become crowded. When plants grow mainly to one side it is because they are growing toward the light. Repotting would not fix that. Instead, you could try starting with a new plant, then be sure to rotate the plant regularly, turning it about a quarter turn, so that it grows more evenly. I am not sure which plant you are calling a Japanese bamboo so it is difficult to give you advise. If it is getting taller maybe you could lower the container closer to the floor to compensate or add a grow light near the ceiling to accommodate more height? Good luck wiht your plants!
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