key growing information

How to Grow Leaf Fennel From Seed

How to grow leaf fennel from seed: direct sowing or cells, spacing, hardiness, and harvesting leaves, roots and seed.
By Hensley’s Seed Co.

Leaf Fennel - Key Growing Information

Planting of leaf fennel, a nonbulbing type showing the characteristic feathery fronds with the aniseed-like flavor.

DAYS TO GERMINATION:

Seedlings appear in 7–14 days at 65–70°F (18–21°C).

SOWING:

Sowing in place is recommended, as soon as you can after the last spring frost. Plant ¼–½" deep and ¼–½" apart in rows 3" or more apart. No thinning is needed for leaves, but you can thin to 4–6" later for bigger plants or for seed. For transplants, sow ¼–½" deep in containers or cell trays and plant out after the last frost, 4–6" apart in rows 4" or more apart.

LIGHT PREFERENCE:

Full sun.

PLANT HEIGHT:

Grows about 24–36" tall.

PLANT SPACING:

1/4- 1/2".

HARDINESS ZONES:

Hardy in Zones 7–10; usually grown as an annual or biennial.

HARVEST:

Cut leaves and stems for fresh use before flowering. Roots can be dug in fall of the first year, before plants flower. For seed, plants usually need to overwinter, bolting in their second summer where grown as biennials or perennials, though a long, cool spring can bring first-year seed. Harvest seed as it turns its typical grayish green.
Note: Too much moisture during bloom can keep seed from forming.

SOIL REQUIREMENTS:

Needs very well-drained soil.

SCIENTIFIC NAME:

Foeniculum vulgare

Source and attribution

Migrated library resource. Original named people, organizations, research, and factual provenance are retained.