Fennel is best used fresh; the anise flavor diminishes during storage. Fennel freezes and cans poorly. Long storage causes the stalks to dry up, begin to rot, turn brown, or become fibrous, while the interior turns pulpy.
Fennel bulbs will keep in the crisper section of the refrigerator for a week.
Fennel leaves will stay fresh for 3 to 4 days max.
Stored in a root cellar, fennel will hold for about 2 weeks.
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