Cleistocactus samaipatanus

Cleistocactus samaipatanus is a species of flowering plant in the cactus family Cactaceae, native to Bolivia. Growing to tall, it has multiple long, narrow columnar green stems with pale gold spines. It grows vigorously with large, pinky-red flowers in summer.
In cultivation in the UK, this plant has gained the Royal Horticultural Society’s Award of Garden Merit (confirmed 2017). 
However, as it does not tolerate temperatures below , it must be grown under glass, though it may be placed outside during the warm summer months.