Not sure it matters - all of my tomatoes are in pots, at this point 6 foot plus indetermintes or 3 foot dwarfs, all loaded with fruit. I am at the point where I water them all twice a day - just let the hose run full steam into each pot until it runs out the bottom. The pots are on light concrete, full baking sun. The roots roast, then they get cooled - never noticed them reacting to temp swings either way. The key is enough water, esp. when the plants are big and loaded, so they don't get stressed and the fruit starts developing BER.
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Craig
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