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Giant Fennel

Ferula communis

Family: Apiaceae (ay-pee-AY-see-ee) (Info)
Genus: Ferula (FER-uh-luh) (Info)
Species: communis (KOM-yoo-nis) (Info)



Foliage Color:

Unknown - Tell us

Bloom Characteristics:

Flowers are good for cutting

This plant is attractive to bees, butterflies and/or birds

Water Requirements:

Average Water Needs; Water regularly; do not overwater

Where to Grow:

Grow outdoors year-round


6-8 ft. (1.8-2.4 m)


36-48 in. (90-120 cm)


USDA Zone 6a: to -23.3 C (-10 F)

USDA Zone 6b: to -20.5 C (-5 F)

USDA Zone 7a: to -17.7 C (0 F)

USDA Zone 7b: to -14.9 C (5 F)

USDA Zone 8a: to -12.2 C (10 F)

USDA Zone 8b: to -9.4 C (15 F)

USDA Zone 9a: to -6.6 C (20 F)

USDA Zone 9b: to -3.8 C (25 F)

Sun Exposure:

Full Sun


Parts of plant are poisonous if ingested

Bloom Color:

Bright Yellow

Bloom Time:

Late Spring/Early Summer

Mid Summer


Grown for foliage


Other details:

Unknown - Tell us

Soil pH requirements:

Unknown - Tell us

Patent Information:


Propagation Methods:

Unknown - Tell us

Seed Collecting:

Allow seedheads to dry on plants; remove and collect seeds

Gardeners' Notes:


On Jun 21, 2016, coriaceous from ROSLINDALE, MA wrote:

The huge attractive fine-textured foliage is largely basal and forms a mound 3' x 3'. It lacks the fragrance of true fennel.

Blooms in early summer. The bloom stalk typically reaches 6-10', but can reach as much as 15'. Said to die sometimes after going to seed, and can be saved by cutting the flower stalk early enough. Goes summer dormant after bloom if soil moisture isn't reliable.

Grows a taproot and is said to be hard to transplant except as a young seedling. Requires good drainage.

There are forms that produce chemicals that are toxic on ingestion, especially to livestock, and others that are non-toxic.


On Aug 19, 2001, mystic from Ewing, KY (Zone 6a) wrote:

Giant Fennel shouldn't be confused with the culinary Fennel, Foeniculum. These vigorous-growing perennials are found wild in rough, rocky ground of the Mediterranean region. These plants are mainly grown for their interesting and attractive feathery foliage.It grows 6 to7 feet high with a spread of 2 or 3 feet. Its rich green leaves are large and finely cut into very thin, linear sections. The tiny, yellow flowers are produced in rounded umbels on long, stout, branched stalks, from late spring to summer.These plants might die after blooming. They are very pretty planted in the wild garden or by the side of a pond. .