This solitary bluish-green barrel cactus may sucker from the base and in time form a short column with 11-15 acute ribs. It has pale yellow spines and the lemon yellow funnel-shaped flowers appear towards the top from late spring to summer.

Hardiness zones 10 to 11 

Ferocactus glaucescens is naturally found in North America from eastern to central Mexico (Hidalgo) growing on limestone hillsides, particularly on a northern slopes in Juniper woodlands at an altitude of 1200m (3,800 ft). 

It grows in most well drained fertile sandy-stony soils in an open sunny position tolerating hot conditions, drought resistant and sporadic light frost.

The Blue Barrel Cactus is grown for its rounded habit and flowers. It is planted in arid gardens or rockeries as a specimen or used as a large container plant in courtyards.  It is suitable to low mountain regions establishes in 3-5 years and is moderately long lived. This cactus is also grown in containers under glass in cold climates as a specimen. ID 2722

Note:
Moderately water during summer, but take care as the plant rots easily in wet soils particularly during winter. 

Ferocactus (fe-rō-KĂK-tus) glaucescens (glaw-KES-kens)

Cactaceae (kak-TAY-see-ee)