Variations 
var. arborescens 'Fred's Red'
This cold tolerant Cactus from Colorado that tolerates zone-5 and grows to 1.2 m (5 ft) tall by 2 m (6 ft) wide.  Then produces rosy red blooms during summer.

var.  arborescens 'Giant Form'
This vigorous cold tolerant Cactus from west Texas has very thick stems, growing to 2 m (6ft) tall and wide in zone-5.  It produces rosy red flowers during summer.

var. arborescens 'White Towers' 	White Flowered Tree Cholla
This cold tolerant Cactus from Colorado grows to 1.2 m (5 ft) tall by 2 m (6 ft) wide in zone-5.  It produces pure white flowers with green centres that appear during early summer.

var. viridiflorus 	Santa Fe Cholla
This cold tolerant Cactus grows to 1 m (3 ft) tall by 1.2 m (5 ft) wide in zone-5 and produces apricot and green flowers during summer. Under cultivation this plant is dwarfed, normally attains a height of 600 mm (2 ft). This plant may be difficult to obtain requiring a specialist nursery.