I don't know about zone pushing, but I am hoping to get some edible tomatoes this season before the end of July for a change
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I plan to grow some early varietes in 3 gallon containers, small enough for me to be able to carry them out on the deck or inside the house, depending on the temperature.
My choices are: Early Annie, Jagodka and Sophie's Choice
I will also grow Bloody Butcher out in the garden.
Linda