Harvesting fennel is quick and requires only a sharp knife for removal and a ruler or measuring tape for measurement. Harvest the bulbs immediately before use for the best flavor. Fennel may also be allowed to flower, and the seeds may be harvested after the flowers have died.Continue Reading
Brush the dirt away from the top of the bulb, and check the size with a ruler or soft measuring tape. Choose a bulb that is 2 to 3 inches in diameter.
To cut the fennel bulb away from the roots, gently pull the bulb slightly out of the ground with one hand while using the knife to cut the roots away with the other hand. Wash the bulb to remove dirt, and cut off any intact roots before using the fennel.
Fennel bulbs are best when used immediately after harvesting but may also be stored in an airtight container in the refrigerator for up to a week. Fennel seeds may also be harvested from flower heads that have turned brown, while the leaves can be dried and stored in an airtight container for later use.