The Southwest Deserts include the Mojave, Sonoran, and Chihuahuan Deserts.
The Mojave Desert spans Southeastern California, Southern Nevada, Southwest Utah, and Northwest Arizona. It is sometimes called the High Desert because elevations are higher than the Sonoran Desert to the South, which is called the Low Desert. Larger cities include Las Vegas, Lancaster, Palmdale, Barstow, Bullhead City, Kingman, and St. George.
The Sonoran Desert spans Southeastern California and Southwestern Arizona. Because of the long growing season and access to water, the Coachella and Imperial Valleys are important agricultural areas that produce much of the Winter vegetables for the US. Fall, Winter, and Spring are great times for gardening in much of the region. Winter rainfall increases from East to West while summer rainfall increases from West to East. Larger cities include Phoenix and Tuscon, Arizona. Other Sonoran Desert cities include Blythe and Indio in California and Gila Bend and Casa Grande in Arizona.
The Chihuahuan Desert spans an area from South and Central New Mexico through Far Western Texas to the Pecos River. July and August are usually the higher rainfall months.There are areas of irrigated cropland along major rivers with crops of hay, alfalfa, onions, chili peppers, cotton, pecans, and corn. Major communities include Las Cruces, Roswell, Carlsbad, El Paso, Ciudad Juarez, Pecos, Torreon, Saltillo, and Matehuala.
Great Basin Permaculture is a local non-profit dedicated to permaculture design in our dry land community through action and education.
Because of its climate and availability of water, the Imperial Valley is a major agricultural region. A long growing season allows two crop cycles a year. Local farmers produce a great variety of crops, currently more than 100 different types. It is one of California’s top five producers of spinach, potatoes, cauliflower, sweet corn, broccoli and onions. Other major agricultural products include cotton, lettuce, melons, citrus. It is estimated that more than 2/3 of the vegetables consumed in the United States during the Winter months are grown in the Imperial Valley as well as Winter fruit, cotton, and grains.
Larger towns and cities include Yuma, Brawley, Calexico, El Centro, Imperial, Calipatria, Holtville, and Westmorland.
Mavens' Photo Blog titled, "Photo tour of the Imperial Valley: The most productive agricultural area in the world" includes great pictures and information.
The Arizona Cooperative Extension provides free information about low desert gardening including information about growing fruits, nuts, and vegetables.
They've produced this guide with planting dates for common vegetables:
The Maricopa County Master Gardeners are available to answer gardening questions for free in person, by phone, or email.