"The cheap way to do it is find someone planting trees out of those big 15 gallon pots, and insulate it with a roll of that silver insulation used for ducts. "
Daisy, I grow my plants in-ground, so maybe that's why I don't understand this... but I don't remember ever seeing anyone recommend using the insulation on the pots like that. Is that to keep them from heating up too much in the sun?
Good advice, I think, to grow more than the one kind of tomato -- and the suggestion for using a determinate type.