How to Prune common fennel?
No pruning required. Remove spent flower heads to prevent self-seeding

common fennel · Foeniculum vulgare
Also known as: fenkell; fennel; finckle; finkel; Sabbath day posy
Grow in moist but well-drained, fertile soil in full sun. May have the potential to become a nuisance if not managed well. See fennel cultivation for further advice
No pruning required. Remove spent flower heads to prevent self-seeding