Answer: You can harvest the foliage but as the plants grow they will develop bulbs. Here are some general growing recommendations:
Fennel is easy to grow. They prefer full sun and a well drained soil. They will do best in rich soils.Water them during dry periods, once or twice per week. Add a general purpose fertilizer once or twice a season.
Harvest leaves as at any time. Harvest flower heads after seeds have formed and the flower head has died. Extract seeds and dry them in a cool, dry location.
Harvest bulbs when they reach tennis ball size or bigger. Pull every other one out as needed to allow those remaining to grow even bigger.
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