The closest I would ever put pepper plants in a garden or raised bed would be 12", 15-18" is better for some smaller varieties, 24" is more ideal. A 5 gallon bucket is only about 12" at the top and tapers to about 10.25" at the bottom. I'd say you would be really crowding them and get less productive, weaker plants without heavy pruning in the early season if you shared space in the same bucket. Just my opinion.
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