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Peruvian Old Man Size:3/5 Gallon A mature Navel Orange treeThe Best Woolly Columnar Cactus for Phoenix Desert Gardens Espostoa lanata, commonly known as the Peruvian Old Man Cactus, is one of the most visually striking columnar cacti you can grow in the Phoenix Valley. Its tall, upright stems are covered in a dense coat of white, woolly hairs that protect the plant from intense sun and give it an unmistakable silhouette in any landscape. Slow growing but long lived, this Andean native thrives in full sun and