The tomatoes above are from the 2008 season, so here is a picture of our newest addition. Heirloom varieties on our porch.  Notice, one plant per pot!  The first year I started container gardening, I placed two plants in a pot.  Trust me, they grow very large!   If you place more than one plant per pot, they will become root bound, and die early…Which is disappointing!  Take the time to mix compost, add fertilizer, and use extra pots if needed.  It will pay off in July/August when you will have the biggest tomato booty on the block!   Also, remember that if you plant more than four or five plants, you will be sharing tomatoes with your family and friends.   Be mindful of what you will realistically use or donate.  Rotten tomatoes are a pain to clean from the deck, and can attract rodents.