I have had pretty fair success with the tomato plants with some really impressive harvests but tp put it in a word.......WATER! Sounds like your clime is better but don't let them dry out!
Want to have some fun and get a lot of comments? Take your big #10 can with one end cut off as usual. Cut a 3 inch hole in the center of the other end. Plant a cherry tomato like the hot100 in the hole and fill the can with dirt up to about an inch from the rim. Drill a couple of holes and put in a rope handle and hang it up. The tomato is growing DOWN out of the bottom but then naturally turns up as it grows! When it begins to grow over top of the can support it so it can fall over and go back down again.
This is a neat turn on the cascading tomato plant and will give you a great conversation piece as well as a more dense looking mass of tomato!