Ferocactus — 14 species

Ferocactus are stout, heavily ribbed barrel cacti native to the deserts of the American Southwest and Mexico, prized for their dramatic hooked or flattened spines and occasional bright flowers. They demand full sun — a south-facing window or outdoor exposure is ideal — and extremely infrequent watering; allow the soil to dry completely between drinks, especially in winter. Toxicity varies across the genus: some species, including Ferocactus wislizenii, contain compounds that can cause digestive upset or temporary paralysis if ingested. Always check each species before buying if pets are present.