Echinocactus polycephalus

Echinocactus polycephalus are rarely seen blooming in culture. It is a very slow growing plant that flowers only once reaches a size of 6-7 or more inches across. Sometimes rescue plants of wild origin available for sale, but they are pretty expensive. And wild plants often resist adopting to the new home conditions.
The so thought after blooms are somewhat indistinct, dirt-yellow petals tend to disappear in a spiny mess of a large plant. Blooming time is August.