Cut the bottom off a plastic pot to contain invasive plants & bury in the ground. use a larger pot so that the plant can spread it's roots and grow deeper roots, but keeps other tree roots from choking out the one planted.
"Planting a vegetable garden in pots - Place raw uncracked egg in bottom. As it decomposes, it naturally fertilizes your mini- veg garden. Do outside of course!" And be sure that your pots are protected from raccoons.
Why a tomato cracks and what to do about it and a lot of other information about caring for tomato plants Should have read this earlier in the season, I have had a lot of cracked tomatoes, Angela Lumpkin