Fauna
Plant

Fennel

Foeniculum vulgare

Also known as Wild Fennel, Sweet Fennel

Fennel produces tall, hollow stems crowned with broad umbels of minute yellow flowers that emit a pervasive aroma of sweet anise. Indigenous to Mediterranean coastlines, it vigorously colonizes roadside verges and coastal scrub, serving as an indispensable host plant for swallowtail butterfly caterpillars. Dense clusters of fine, threadlike foliage allow it to thrive in arid, sunbaked soils where few other herbs persist.

AromaticPerennialHost Plant
Fennel reference1 / 7
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Least ConcernConservation statusIUCN Red List categoriesLCNTVUENCREWEXLeast ConcernRed List categories, explained →
Key facts
Diet & preyAutotrophic (photosynthesis)
Predators
  • Anise Swallowtail Caterpillar
  • Black Swallowtail Caterpillar
ThreatsHerbicide application, repeated mowing, and invasive weed eradication programs
HabitatsCoastal bluffs, roadsides, riverbanks, pastures, and disturbed grasslands
Life spanPerennial (typically 2–5+ years)
Classification
  1. OrderApiales
  2. FamilyApiaceae
  3. GenusFoeniculum
  4. SpeciesFoeniculum vulgare
Range & activity
Range data is not available yet.
Safe observation
Interaction riskLow
  1. Low
  2. Moderate
  3. High
  4. Very high
Why interaction risk is low
Safe to observe at a normal distance, though easily confused with toxic poison hemlock.
Responsible observation
  • Aroma Check: Rub a leaf between fingers to detect the distinct aniseed or licorice fragrance.
  • Stem Inspection: Check stems to ensure solid green coloring without purple blotches common to hemlock.
  • Caterpillar Finding: Inspect lower feathery foliage in midsummer for striped swallowtail larvae.
Related species
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