They are found in the southwestern United States and northwestern Mexico. This page belongs to our "exotic pets and plants series" articles which do not focus on aquarium fish, but to other species that are often kept or grown by hobbyists. Bright lemon yellow, funnel-shaped flowers, 2 in. Taking Care Of Ferocactus Glaucescens “Blue Barrel Cactus” Ideal conditions. Brief Description. Ferocactus is a genus of large barrel-shaped cacti, mostly with large spines and small flowers.There are about 30 species included in the genus. Scientific: Ferocactus glaucescens (syn. They last a very long time and form a discreet ring at the top of the plant. Ferocactus glaucescens (Blue Barrel Cactus) is a globose to cylindric bluish-green cactus with 11-15 prominent ribs adorned with areoles sprouting long, pale yellow spines, up to 1.5 in. The spines are rather neatly distributed, and the unusual-looking white fruits are unmistakable. Advice by Mick. It grows up to 2 feet (6 cm) in diameter and has 11 to 15 ribs, 6 to 7 radials, and no or rarely one central spine. Ferocactus glaucescens. What also makes outdoors an optimal location for this cactus is its high light requirements. Feel free to share your experiences with this cactus at the bottom of this page! Ferocactus glaucescens This Ferocactus stands out from the other species. Plants are slow growing to start, but they are easy to grow and require little care once they have reached a good flowering size. Reaching 18 inches in diameter and over 1 foot in height, Ferocactus Glaucescens “Blue Barrel Cactus” is perhaps the best to keep outdoors for unimpeded growth. Ferocactus glaucescens are spherical in shape with prominent spiny ribs and funnel-shaped yellow flowers in summer. wide (5 cm) are produced in late spring to summer. Ferocactus pfeifferi) Common: blue barrel cactus Family: Cactaceae Origin: Rocky limestone slopes in deciduous dry forests and juniper scrub woodlands of east central Mexico, 2,000 to 7,500 feet elevation, endemic. Ferocactus glaucescens is a slow-growing cactus with a usually solitary, bluish-green, spherical or cylindrical stem. (4 cm). Though it can reach over 45 cm in diameter, it will nonetheless flower perfectly well in an 20 cm pot.