Discocactus horstii

The distinctive white, woolly structure that develops on top of the Discocactus horstii is called a cephalium. This dense, hairy growth forms when the cactus reaches sexual maturity. The cephalium is the plant's reproductive structure where its small, nocturnal flowers will eventually bloom.

Discocactus horstii is known to be somewhat challenging to cultivate and is generally recommended for more experienced cactus enthusiasts. It is highly sensitive to overwatering and requires a specialized, highly mineral substrate to prevent root rot. Furthermore, it requires a tropical climate with warm temperatures, as it cannot tolerate frost.

This specific species of cactus is endemic to Brazil, meaning it grows naturally nowhere else in the world. It is native to the rocky outcrops and dry savannas of the state of Minas Gerais. In this natural habitat, it grows wedged into crevices of bare rock and quartzite gravel.

The flowers of the Discocactus horstii are small, tubular, and typically white in color. They are nocturnal bloomers, meaning they only open during the night to attract pollinating moths. The flowers emerge directly from the top of the plant's fuzzy white cephalium and emit a pleasant fragrance.