ECHINOCACTUS grusonnii / (Barrel Cactus, Mother-in-law's Seat)

frost tender perennial cacti (min: 11°C)
height: 2m.
spread: 2m.
requires well drained soil
hemispherical stem forming habit
pale yellow colour flowers borne on large stems in summertime
globular green stem ribbed vertically with spines and capped with a woolly crown