I've had that happen to almost all of my seedlings. They've always grown out of it as they mature after transplant.

The plant is telling you that it is to cold. It will slow growth and make a stronger root system, It is a good thing IMO Bill

Thanks for the reply they do seem to be shooting out some really thick roots.

regodus,

I'm curious about your growing schedule. When did you plant your seeds, and when do you plan on harvesting fruit? Are you growing in a greenhouse? I'm in SC and wait until February to plant seeds, so I've got plants ready for when we've had our last frost in April. If there's a better way, I'd like to hear about it. Thanks, Tom

Hey Kent, Got to get you a Green House. can`t fool mother nature.; We without GH have to waite. Good Growing;--- this spring. Bill

Hey Kent, Got to get you a Green House. can`t fool mother nature.; We without GH have to wait

Not true! People have been doing it for decades. I've got several plants growing under artificial light and doing rather well. I've harvested about a dozen fruit from a Sungold Select so far and have started Black Brandywine and Green Grape plants as well.

When they turn purple, they need phosphorous - the P in NPK. Whatever fertilizer you use, be sure it doesn't have more N -nitrogen- than phosphorous or you will get great foliage and no flowers/tomatoes.

Well now it seems I have another problem. I just transplanted them under 4x600w HPS lights. I am watering them once a day but they seem to be wilting from the bottom leaves on up. Also they are not really reaching for the light like they should. EC is at 2.5 and pH at 6.0. They are about 18" tall. Any advice?! I need help!

If you have just transplanted them, the most likely problem is transplant shock, which they will usually come out of in a day or three. Larger plants can take longer to come out of it.

If a the transplant was done more than a few days ago, there probably is something else, but to know what the issue is, we'd really have to have more information.

Any changes other than transplanting? Are they in the same growing medium as before? Did you change nutrients mix/ratio/? (I am assuming that since you are growing in rock wool, you are growing hydroponically.)

Can you post pictures?

If you are growning hydroponically, this may not be the appropriate forum to ask your questions about the wilting issue, it could be a "normal" issue for hydroponics transplants, so you may want to visit that forum (link below) since most of us in the tomato growing forum don't have hydroponics experience. I suggest searching their forum before asking, if it is a common issue, the question has probably been asked and answered before.

The more information you can give us, in either forum, the better the chances that someone can give you an accurate diagnosis.

Here is a link that might be useful: Hydroponics Forum