Pillar (columnar) cacti are tall, slow-growing, drought-tolerant plants, often living 150–200 years and reaching heights up to 52 feet, featuring vertical ribs for water storage. They thrive in full sun, require minimal care with infrequent watering, and are used for architectural, vertical, or "living fence" landscaping. Popular types include the Saguaro, San Pedro, and Mexican Fencepost. 

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