Echinocactus grusonii, commonly known as golden barrel cactus, golden ball or mother-in-law’s cushion, is one of the most cultivated cacti. At maturity, the stem of this cactus changes from a spherical form to a barrel form with 21 to 37 dark-green ribs. The plant has very numerous areoles on each rib and white colored woolen hairs at the top. Bright yellow flowers appear in the upper areoles in summer.
The Barrel cactus is primarily suited for growing in garden rockery settings, desert type landscapes, patios and botanical gardens. They are grown indoors inside conservatories or other glass rooms where enough sunlight is provided. However, they seem to have great difficulty flowering indoors