Growing tomatoes in pot culture can be a challenge. If the wilting is not bacterial, then the first thing that comes to mind is a possible drainage issue. When growing in a pot, tomatoes are usually faced with a dual problem, as they constantly move from too wet to too dry. A ceramic pot is likely to have limited drainage, and that could be the problem. If the soil is staying too damp, lots of roots could begin to rot in the sour soil deeper in the container. When growing tomatoes in a large pot, I always opt for large nursery containers that have five or six drainage holes around the bottom edge. I also add lots of perlite to the soil to keep it from getting water logged. If I understand you correctly, that your plant wilts but recovers at night, that may make sense with root loss. The plant may not be able to keep up with transpiration during the day, but in the cool temperatures of night can keep up.
Last edited by hendi_alex
on Thu May 03, 2012 12:25 pm, edited 1 time in total.
Eclectic gardening style, drawing from 45 years of interest and experience. Mostly plant in raised beds and containers primarily using intensive gardening techniques.