My seedlings are about 1 1/2" - 2" and now the first set of true tomatoe leaves are appearing. I'm concerned they are going to get top heavy and bend over. I started them in a cardboard egg container, they get plenty of light during the day, I rotate them so they don't lean toward the light and then at night turn on a florescent light. When is the best time to transplant them? This is my first attempt at starting from seed.
I am no expert and pretty new to this myself: But, I'm in FL, so started on my toms quite a bit earlier than most places. From what you stated, it seems like you have made a good start and started just like I did. From where you are now I thinned my seedlings to only one stem( if you have more than one stem growing) then when the first true leaves were established more, I replanted into 4 inch jiffy pots, using potting soil with just a pinch of bone meal. From here my plants just took off, when they got to 8-10 inches I replanted outside after leaving them outside for about a week. As you have read on here I'm sure, make sure you plant the root ball quite a bit lower in your new pot every time you re-plant. As I said, I am new to this, so I would wait for the moderator to give you proffesional advice. What I just said did get me to the point where I am now, six, six ft tall tomato plants, with blossoms, I am just battling FL heat and praying for some fruit. Good luck.
P.S What a great forum this is.