I have transplanted tomatoes into 4″ pots. I started with 50 seedlings (100 because the first batch 50 failed due to weird new peat pellets and my not looking at them until the seeds dropped into a huge hole in the new pellets).
I am now down to 30 pots with 25 spaces available in the garden. My second tray of seedlings using good old jiffy brand pellets had a 90% germination rate with only 5 of 50 pellets not sprouting a seedling. The strongest plants were transplanted and all others will be burned.
ALL parts of the tomato plant except the fruit are toxic. I do not turn them into the soil, nor do I compost them, nor do I feed them to my critters. I let them dry out, then burn them and avoid the concentrate smoke.
These are really cramped together and I need to have more than just the two lights at this point.
I also add a spit or two of diluted seaweed fertilizer from Maxicrop as the first fertilizer these babies get.
They are ready for transplanting and their first fertilizing after the first true leaves appear. This does not count the cotelydon (first rounded pair of green things that come up with the first sprout).
During the transplant, the cotelydon can be pinched or cut off and the seedling should be planted deep withe the first true leaves barely above the soil. The node where the leaves meet the stem must be above the soil line. The hairs on the stem that are buried will form roots making a stronger plant to support a heavy load of ripe tomatoes in August/September.
These little guys should be about a foot tall in another two weeks. The larger plants are about 2 weeks older than the little ones.
5 more weeks until they go in the ground outside around June 1.