Posted: 29/05/2015 at 17:39
Sounds like you're definitely overwatering, Irene, which - as Dove says - will cause leaf curl. I responded to your question on Simon's thread.
For toms in the ground, the rule of thumb is to water infrequently but deeply. This sends the roots deeper into the soil. Frequent shallow watering only keeps the roots hanging around the surface. As an example, mine are in the ground, the temps are now into the mid-high 20s, and I'm not watering more than once a week. But when I do water it's deeply.
For toms in pots, the mix should not be permanently damp. Few plants like constantly damp feet and toms aren't one of them. You can afford to let the mix dry out between waterings. And when you do water, water deeply.
As an overall rule of thumb, toms thrive on "tough love". Or, in other words, controlled neglect. A tom produces fruit in order to reproduce itself before it expires and your basic aim is to create an environment in which the plant feels a tad threatened, encouraging it to reproduce. An overwatered, overfertilised plant doesn't feel threatened, just bloated. In short, less of everything is better.