I thought I would offer some advise for those planning on growing tomatoes in containers in the desert.
The main problem with tomatoes in the desert is you have a little 4 inch pot of roots for a foot tall tomato plant. while that works well in most areas and the green house once the scorching sun and 90+ degree heat hits there is no way 4 inches of roots can hydrate a foot tall tomato plant. So here is what seems to work well for me and others here.
Then I put the tomato in the container and cover all but the top 2 inches or so with soil.
Then I water it well and it should have a fighting chance in the heat to survive, it will take about three days before new growth resumes but it is worth it, the tomato plant thrives even when the heat gets up there, they seem to set blossoms and fruit without any problems when the plant can get enough water from its roots to stay cool.
If your tomatoes seem to burn up when the heat comes give this a try.