Searing summer heat. Minuscule annual rainfall. Nearly nonexistent humidity. Arid soil that’s more like cement than dirt in many places. No wonder that even the most experienced local gardeners compare Southern Nevada to Mars when it comes to inhospitable places for plants. “When the NASA rover beamed back the first images of Mars’ surface, a friend of mine joked that it looked like her backyard,†said M.L. Robinson, who’s lived in the Las Vegas valley for 20 years.
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