Depending on variety 13 inches is pretty close. It will work but yield may be less and the bugs are going to have a field day. It will be difficult to spray neem or what ever you use on the underside of leaves planted that close. If bugs are not an issue then i say go for it.
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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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