Glandulicactus wrightii 'Bishops cap'

Glandulicactus wrightii seed was collected at Bishops cap in southern New Mexico. Plants are wild swirly spined at maturity. These are seed grown and 2 years old. Plants need radical drainage to survive. Plants grow in limestone cracks in the wild so they rarely have water hang around long. A few numbers of these this go around.
 
We have had this plant in our colorado garden for 15 years but these require a special situation to survive. They have taken -22F many times.
 
I do not guarantee these in a zone 5/6/7 as everyones situation is different.