Echinocactus polycephalus

Echinocactus polycephalus is a cactus symbol of Mojave desert. The very hansom plants occur in the driest places, where summers are oven hot and winters bring frost every night for several months. All the years water supply plants acquire during the pleasant time of early spring when soil is still wet from winter rains and temperatures are high enough for plants metabolism to go active. The plants will not bloom in the spring though, waiting for dead heat of August to open their modest yellow flowers.
Echinocactus polycephalus is very slow growing plant, which is unusual for cacti that large. They are also very rarely seen in cultivation. Rising nice specimen like this from seed would take longer than life time.