How to Prune giant fennel?
To enhance foliage, remove flowering stems as soon as they appear or after blooming if seed is not required

giant fennel · Ferula communis
Also known as: meeting seed
Grow in fertile, well-drained soil in full sun; protect with a dry, bracken mulch in winter. May die after seeding.
To enhance foliage, remove flowering stems as soon as they appear or after blooming if seed is not required