Coryphantha sulcata

Coryphantha sulcata has long been a cold hardy species for us in Colorado. This species is found in central to north Texas and has taken -22F for me many times. These are also very long-lived species, we have had them for 20 years in some cases. They can clump but in over the 20 years ive not had many clump.These areas get drought and at the same time huge thunderstorms and ice storms. These plants are definately worth trying. Our plants are from garden seed and no exact location.
 
Please remember ever garden is different and try at your own risk.