You can grow a wide variety of vegetables throughout the year in Arizona, such as tomatoes in the summer and romaine lettuce for fall/winter. Follow this web link on How To Plant Vegetables In Arizona for additional information on various crops that grow in Arizona.
EnergySoil is a 100% Natural Organic plant growing medium made from coconut husks and it has many good qualities. Homemade compost is an option to consider. Here’s a link on how to build a raised garden box.
Native Seeds comes to mind as a great source for seed varieties that have been proven to perform in the Arizona and the desert southwest climate. They have a large farm in southern Arizona where they grow seeds for distribution and preservation. While not certified organic, they minimize chemical use.
If you’re a carbon footprint watcher, growing a portion of your food or buying from a local grower greatly reduces the amount of energy tied up in the food you consume. Buying locally also improves your local economy.
Life’s a Garden comes to mind as an experienced company that can provide a full range of garden design and installation services. Growing your own vegetables with captured rain water and homemade compost and you’ve got a recipe for sustainability.