Armatocereus laetus. Hardy to 35° F. Tropical cactus, protect fom frost. Full sun to part shade. Columnar tree cactus, up to 20' tall. Regular water summer, little water in winter. 4" long, white nocturnal flowers. Origin: Northern Peru

Armatocereus mataralensis

Armatocereus procerus. Hardy to 35°F. Tropical cactus, protect fom frost. Full sun to part shade. Columnar tree cactus, up to 25' tall. Regular water summer, little water in winter. 2" diameter, 4" long, white nocturnal flowers. Origin: Southern Peru.