Tucson is in the forefront of 
xeriscaping, a wonderful, if retro by several thousand years, concept.  Shirley, however, has always xeriscaped, and I love its zen calm. Plants around the base of the house add a bit of color, without being gaudy, and more native vegetation blends the property into its desert habitat.
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| Recently planted, and not native, I take some pride in keeping this bougainvillea thriving in Shirley's absence. (OK, I do see the misplaced modifier, but I'm retired, so what the hell.) | 
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| A prickly, and colorful in springtime, welcome to visitors | 
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| Barrel...doh. | 
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| Prickly pear....beautiful blossom but ouch! | 
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| Variety of hedgehog -- the herbivore version | 
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| Ocotillio in the spring, before blooming.  Indigenous.  Used for fencing around patios and for animal enclosures. | 
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| As with oaks and maples, spring brings green leaves to the ocotillo in Shirley's yard. | 
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| Quite the ouchee, if you fall into it. | 
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| An agave, perhaps the source of tequila.... | 
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| Even in the desert, life springs up.  These two little cacti volunteered between the water hose and the house.  I repositioned the hose nozzle for scale. | 
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| And yes, green, green, green, even in the desert -- staunch ironwood |