Mammillaria meicantha Baca county, CO

Mammillaria meicantha is a cold hardy plant from southeastern Colorado, New Mexico, Oklahoma and Texas. The seed for this plant was collected near Campo, Colorado. These have taken -17F for us. This location was found by us in Colorado several years ago. You can read about it in the Cactus of Colorado book.  These bloom white-cream in early spring and get a deep taproot like a turnip. 
 
We share our experiences to help with your own trials of cold hardiness. We do not guarantee these plants in any garden or zone. Every garden is different and everyone's growing conditions are different. Please try plants at your own risk, I do not want to be misleading to anyone.