The Golden Barrel Cactus (Kroenleinia grusonii), also commonly known as Echinocactus grusonii, is a striking and iconic species of spherical cactus recognized for its symmetrical, ribbed body and dense covering of golden-yellow spines. Its shape resembles a barrel or globe, often forming a solitary dome or, with age, multiple clustered heads. Native to central Mexico, particularly the states of Hidalgo and Querétaro, it thrives in arid volcanic slopes and rocky outcrops.

Despite its intimidating appearance, the cactus occasionally produces small, yellow flowers at its crown during warm months. Due to habitat loss, the Golden Barrel Cactus is considered endangered in the wild, but it is widely cultivated in gardens and botanical displays for its bold form and architectural presence. It is frequently used in desert landscapes and drought-tolerant designs, appreciated not only for its resilience but also for its dramatic contrast when paired with softer plant forms.