What is pot made of? Are there holes in the bottom and how many?
How BIG is BIG?? Put a garbage bag in it, either count measured amounts to fill, or put on a scale and fill. Total weight minus weight of pot, then divide by 8.33 = gallons.
Will you be watering this never? Once a week, once a day or multiple times a day?
Pot on concrete, on stones or on mulch?
Crepe myrtle is a bad choice for many reasons.
Without answering these questions, no one can give you an actual good answer.
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