In the end, it was those reddish spines at the cactus's top that enabled me to identify it in Alfredo Flores's Guía de Cactáceas del Estado de Coahuila as FEROCACTUS STAINESII ssp PILOSUS. Mexican Lime Cactus, Fire Barrel, Mexican Fire Barrel Cactus . wide (5 cm) are produced in late spring to summer. Mexican Lime Cactus or Mexican Fire Barrel (Ferocactus pilosus) (Werdermann): A large barrel cactus that sports funky, pink spines.This species has 13-20 ribs lined with red to pink spines. It should not sit on the water, and an excess amount of water should be avoided. In the wild, mature plants can reach up to 10.0' tall and 20.0" in diameter. Click on the pictures for full plant details and prices. Endemic to Mexico, it’s best grown in temperate climates as a houseplant, where it makes an interesting feature in the conservatory or windowsill. Ferocactus pilosus. This succulent type needs typical watering as the other succulents. (4 cm). They last a very long time and form a discreet ring at the top of the plant. Description:Ferocactus pilosus is a simple or clumping barrel/column cactus with thick red spines. Ferocactus Pilosus ‘Mexican Fire Barrel’ can be quite beautiful when it is well-taken care off. Description: F. stainesii is a simple or clumping barrel/column cactus with thick red spines. Ferocactus pilosus is a striking barrel cactus with thick red spines. In habitat plants must be a great age, often forming into quite massive groups, with several subsidiary barrels growing from the main one, with deep green bodies densely covered with … The watering method is very important to keep your Mexican Fire Barrel healthy. 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. Bright lemon yellow, funnel-shaped flowers, 2 in. Initially globe-shaped, plants eventually grow tall. Ferocactus pilosus Blessed with fantastic coral red spines and white hairs on the areoles. Being such an impressive species, it's known by several English names, including Mexican Lime Cactus, Mexican Fire Barrel Cactus, and just plain Fire Barrel. Ferocactus pilosus .