Ferocactus are a group of cacti that grow into large barrel shapes but are extremely slow growing, most reach 40 to 50cm across in 15 to 30 years. Yellow flowers appear from the centre of older plants in spring.
Position - under protected partially shaded positions outdoors; indoors only in sunny positions otherwise they will lose their nice shape and colour. Flowering will only occur in good light.
Watering - can be watered all year round and grow fastest in the warmer months, plants will survive without water for very long periods and remain compact when dry.
Feeding - 25% of recommended dosage monthly in growing period. The less fertiliser the better the shape of the plant, fertilisers high in nitrogen can produce larger plants with less colour.
Repotting - can be left to overgrow their pots, or repotted in the warmer months in almost any well drained potting mix.