Low Desert Zone

What is the definition of LOW DESERT? And, why do we need to know the definition, anyway? Sunset's Western Garden Book has identified it as Zone 13. The area takes in Phoenix,hugs and follows the Colorado River north almost to Lake Mead, includes Imperial Valley, Death Valley, dips south below the Border and, most importantly, includes Borrego Springs. Elevations range from below sea level to around 1,100'. Summer temperatures hover above 100 degrees. Monsoon or summer rain is common. Winters are mild with very few nights of freezing temperatures - and very rarely, severe freezes that require plant protection. This large area is classified as subtropical desert. But, all gardeners know that even within this zone are many micro-zones...in fact, within Borrego Springs are micro climes, depending on the elevation.
What plants do best in the region? Answer: The Natives, of course. They have developed over many centuries and thrive without any additional irrigation. Any person new to the desert should familiarize himself with native plants before creating his own garden. They should play THE major part in any desert garden.
Along with natives are plants from other arid regions that compliment the natives and can make your garden more interesting.