Answer: Every third day seems a bit arbitrary, since Mother Nature has no dependable plan for balancing hot, dry days with cool, dewey ones. But your friends surely speak from experience in your exact Southern California clime and I will not be one to argue with experience. I do, however, always recommend mulching to maintain an even moisture level and avoid detrimental extremes between one soaking and the next. Yes, you can apply this technique to peppers, remembering that soils leaning to the dry side will produce higher heat in hot peppers.
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