Soil, It's funny you asked that. I was looking at the plastic pot after taking the pic and was surprised to see white roots touching the edge of cup. This took me by surprise because I normaly don't see that when I pot up. I'm wondering how to pot these up, when the soil gets dry, it almost takes on the consistency of a pellet. Maybe I can get these into the larger pots without toching the roots at all? Is that best, or should you loosen the root ball a bit? It seems the roots reaching the sides and bottom are an indication that the seedling is ready for a new home though? I know I'm dwelling on this a bit, but I want to put the healthiest plant possible in the ground. I have 8 or 9 toms in the ground right now, but some of them didn't seem the strongest plants and I'm not sure what they will produce. I'm in Sth FL and want to get some very healthy tom plants in the ground mid dec or early Jan, to harvest in late april.