Coryphantha bumamma (Family Cactaceae) is a very well-known cacti native to Mexico. It grows in subtropical climate, in deep fine volcanic soil, at 450-1400 metres above sea level. The cacti flowers bloom in late summer or early fall. Its pale yellow flowers are sweet smelling. They measure between 5 to 6 cm. Coryphantha bumamma is similar to C. elephantidens but its flowers are much smaller and nearly yellow. Coryphantha bumamma produces an abundant amount of wool. This will wash off if watered from above but will re-grow again. Coryphantha bumamma needs sun to partial shade. It tolerates fairly low temperatures as long as it is kept dry (hardy to -5ø C or less for short periods of time). It is drought tolerant. The cacti needs a very porous soil with good drainage Water regularly but do not overwater. Ideal temperature: 26-30 øC, 78.8 - 86 øF. Coryphantha bumamma is threatened by deforestation from small-holder agriculture and cattle ranching. Hardiness zone: 9-10