I have seen a many in-ground tomato plant with curling (lengthwise) leaves and the plants were fine and producing. As long as the leaves aren't yellowing or spotty while curling (which could be a symptom of mites or other insects), then it's just the plant's response to the sun and hot air (curling or wilting is a defense mechanism that allows the leaves to reduce the amount of leaf surface area that could dehydrate).

My tomatoe plant was wilting and turning yellow. I got a lot of suggestions,the soil, over watering, needs to be fed. And I'm sure all of them had something to do with the problem. But what helped me the most was transplanting it in a bigger container and cutting back on my watering a little. I was watering every morning, now I water every other day unless like today it was 98 in the Kankakee area.
Hope this helps
Jolene

You can find lots of threads on this subject in the Tomatoes forum, but if I recall correctly, uneven watering is often the cause. It's not normal, but not fatal either.

I have a big problem this year with my cherry tomatoes getting blossom end rot. I used 7 new pots this year with new organic potting soil and they seem to be fine. I used older pots with the older soil, but I did replace some of the soid with the new organic potting soil. These older pots are having the bigger problem with the blossom end rot. Could the problem be too much of the older soil?

I dont think it is the soil as much as the water, each day go out to your pots, dig 1 finger as deep as you can and if you feel moist soil it dont need water, too much water is the main reason for ber.

I grow at least a dozen different varieties of cherry tomatoes ever year & have never ever seen a cherry tom get BER!

I use 4 gallon square buckets with anywhere from a third to half municipal compost and the rest Pro-Mix BX, (mixed together) and some time release fertilizer, etc. Consistent watering is the key with container tomato plants. Regular fertilizing too, especially since nutrients get washed out regularly. Garden is also on drip fertigation.

Leaf curl is usually a physiological disorder, not often a serious problem and usually goes away or the plant lives with it.

Mark

Yep. I've got 5 plants in containers, and the lower leaves are curled on most of them. The newer the leaves, the less curling. The older curled leaves won't uncurl, but don't worry about that.