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The typical habitat is hot and very arid, and the plants have adapted to exploit water movement to concentrate their biomass in areas where water is likely to be present. Like Sclerocactus , Ferocactus typically grow in areas where water flows irregularly or depressions where water can accumulate for short periods of time.
The plant blooms in spring to early summer, producing funnel-shaped flowers with a purple-red midvein and red,yellow to white margins, reaching lengths of up to 4 cm (1.6 in) and diameters of 3.5 cm (1.4 in). The elongated yellow fruits are about 2.5 cm (0.98 in) long and do not open at a basal pore.
Ferocactus hamatacanthus develops elongated glands, usually 2 centimetres (0.79 in) to 4 centimetres (1.6 in), in the aeroles between the flower and the spines. At first, these glands are soft, but as they mature they become hard and spine-like. Another key feature is the difference of its fruit compared to other species.
The bell-shaped, yellow flowers of Ferocactus glaucescens are up to 4.5 cm (1.8 in) long and 2.5 to 3.5 cm (0.98 to 1.38 in) in diameter. Its spherical, whitish or yellowish, red-tinged fruits are fleshy, reaching lengths of up to 2.5 cm (0.98 in) and covered in yellowish, ciliated scales.
Ferocactus haematacanthus is a solitary cactus with initially bluish-green, later green stems, growing up to 30-120 cm (47 in) tall and 25-36 cm (14 in) in diameter. The stems have 13-17 ribs and bear reddish thorns. Adult plants have merged areoles. The red spines consist of four central spines measuring 4 to 8 cm (1.6 to 3.1 in) long and six ...
Ferocactus johnstonianus is a solitary, spherical to short cylindrical cactus that can grow over 1 meter tall and up to 35 cm (14 in) in diameter. It has 24 to 31 slightly humped ribs and 22 to 25 golden-yellow, awl-shaped spines that turn brown with age and reach up to 6 cm (2.4 in) long, without differentiating into central and radial spines.
The plant blooms from April and May. The funnel-shaped, yellow flowers are up to 6 cm (2.4 in) long and 5 cm (2.0 in) in diameter, while the spherical fruits are yellow, fleshy, and 2 to 4 cm (0.79 to 1.57 in) long.
Ferocactus flavovirens forms clusters with plants growing up to 1 meter tall and more than 2 meters wide, with numerous spherical to cylindrical shoots. These shoots are light or gray-green, reaching heights of 30 to 40 cm (12 to 16 in) and diameters of up to 40 cm (16 in), with 13 sharp ribs and widely spaced areoles.