Echinocactus grusonii (Golden Barrel)
The very popular “Golden Ball Cactus”, a native of Mexico and often seen in architecturally landscaped gardens. It usually attains a height of around 70 to 90 cm, but can reach as much as 130 cm tall in older plants with a diameter of up to 80 cm. The number of ribs varies, but may be as many as 40 or as few as 20. The spines, a feature of the plant, are golden yellow, but become darker with maturity. The flowers are also golden yellow, and often only fully open in strong sunlight. The cactus likes a sunny position in well-draining soil and is tolerant of the occasional light frost.