If you're going to plant a desert garden in containers there are some things about the containers you need to know and do.
There are some things you should do with pots before you plant in them, especially if they're old, used pots.
They need to be sterilized with a special solution. The article Container Desert Garden Pots describes how to clean the pots. The article will also describe how to cover (not plug) holes in the bottom of pots.
Additionally, read about some plants that do well in containers in the desert heat. These include Russian sage, irises, coreopsis and garlic chives, among others.