I have a son who lives in Clarksville ,TN. He has raised bed that are 4'x10' and are 3" deep. He puts 5 plants in the beds. One close to each corner and then puts one in the middle. He has 1x1 wood strips nailed to the sides for support and and wooded strips over the top where once they grow 8 to 10 foot tall they lay on the top . He has huge tomatoes and great production. The plants get real bushy , but he does keep the bottom cleared out good as they grow. I think doing that for him promotes enough air flow and he doesn't have any problems with disease. At first he tried putting 6 plants in the bed, but it was too crowded and hard to manage.
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