Moringa Species, Ghost Tree, Phantom Tree

Per Jan Emming of Destination:Forever Ranch and Gardens, a 40 acre desert botanical garden/sustainable living homestead, AZ about his pho...Read Moreto above and the plant:
"Moringa ovalifolia is a fascinating succulent tree whose habitat is restricted to certain regions of Namibia and southern Angola. The smooth white bark and fresh green foliage are characteristic at even a significant distance, as is the swollen caudiciform trunk. Found most commonly upon rocky hillsides and escarpments in the mountainous regions just east of the coastal Namib Desert, Moringas are very desirable horticultural specimens, although their intolerance of frosty weather limits their use in the landscapes and botanical gardens of many developed nations. Which is a shame. I would truly like to have one, or 50, in Arizona, but my particular gardens are in a zone too cold for these beauties. This twin-trunked specimen is about 20 feet/6 meters tall."