could be one or more reasons.

Most likely are cultural stuff such as too hot or cold; too wet or dry;fertilizer too much or too little; poor air circulation.

Please provide a few clues.

Also. please post an image of the growing set up and of at least one entire, typically affected plant.

One possible clue is that I have two plants that have not been affected by this. They are the only two cherry tomatoes (sweet baby girl, which by the way I highly recommend). The others are a mix - early girl, beaverlodge slicer, katana, tasti-lee.

Here are photos of the entire setup and one plant. If they look leggy, it is mainly because the lower branches have been pruned because of this problem. I only fertilized once since planting because the miracle grow potting soil is supposed to have fertilizer in it already. They do seem to be a bit light in color, but I am not sure if that is just the varieties. Different varieties do have different colors. The sweet baby girls that are thriving are a much darker shade of green.

John Inor: transplanted into 6 inch pots with Miracle Grow Garden Soil

"Garden Soil" and not "potting mix"?

Garden soil is a whole different beast. It's intended to be put in garden beds, not used in containers. In containers, itwill have moisture issues (usually too wet, inadequate drainage) and it may not be free of common mold and fungal spores.

I would cut off the affected foliage and re-pot into an actual mix for containers and see whether the situation improves. A treatment with fungicide in case it's botrytis or something similar can't hurt.

Thanks for responding. Yes, the package says garden soil, but it looks like other stuff I've had that was labeled potting mix. It isn't really heavy like some garden soil products I've seen, but does have a lot of of wood bits, but no more than most of the potting mix products I've purchased in the past. The sweet baby girl cherry tomato plants are doing great in the same soil.

I am about a week from transplanting into the garden, so I'm not going to re-pot this year, but I'll look for better potting mix next year. I guess I'll spray with fungicide when I transplant.

John Inor: I guess I'll spray with fungicide when I transplant.

Just in case you do have fungal disease right now, I wouldn't wait. Most fungicides available to the home gardener that are safe to use on veggies are not curative. They prevent and/or delay disease progress. So the earlier you get it on affected plants, the better. Ideally, you'd get it on plants before exposure to disease.

Did you ever figure out why the plants did this? mine look identical to this.