Ferocactus wisilizeni 'Red Flowers'

Ferocactus wisilizeni or Arizona Barrel Cactus is a large cactus from southern AZ and southwest NM. This was seed from a few garden plants that had Red flowers. The plants could still have orange flowers but so far the seedlings have stayed with the mother plants characteristics. These are 2 year old plants from seed. Ferocactus wisilizeni has shown some cold hardiness when kept dry in winter taking down to -5F. I strongly suggest covering the plants with a