How to Prune fishhook cactus?
No pruning required

fishhook cactus · Ferocactus wislizeni
Also known as: candy barrel cactus; fishhook barrel cactus
Grow under glass in a loam-based potting compost with added extra grit. Water moderately when in growth, not at all when dormant. Apply a balanced liquid fertiliser 2 or 3 times in the growing season
No pruning required