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Best thing you could do in this situation is provide a picture so we could evaluate the situation. I know this post is old so probably doesn't matter now but there's plenty of information out there to help you out.
If you live in Missouri like me and you don't like the weather just wait another day as we all say. 80 yesterday and in the 40's today, consistent isn't in the vocabulary when it comes to weather around here.
Being that you are referring to veggies I second that opinion to go at least 18 inches, maybe 16 at the very least.
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