If by 5 gallon buckets you mean 5 liquid gallons like a home depot bucket then yes that size is more than sufficient. If they are 5 gallon nursery pots they will still work but you will have to keep up on your fertilization. I use the 5 gallon nursery pots and do just fine. Depending on variety you may need more or less area for roots to grow.
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“Enter by the narrow gate; for wide is the gate and broad is the way that leads to destruction, and there are many who go in by it. Because narrow is the gate and difficult is the way which leads to life, and there are few who find it."
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