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Fennel Sowing: Techniques and Crop Management

From sowing density to the most suitable technologies: a practical guide to growing fennel efficiently and professionally.

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Fennel Sowing: Direct Sowing or Transplanting?

The choice between direct sowing and transplanting depends on the cultivated area, the production schedule, and the farm’s objectives.
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Direct Mechanical Sowing

- more common on large-scale farms
- reduces time and costs
- uses pelleted seed
- requires pneumatic or mechanical precision seeders
- tends to slightly extend the crop cycle

Transplanting

- suitable for late harvests
- useful for smaller farms
- can shorten the crop cycle
- requires a nursery or ready-to-transplant seedlings
- allows the selection of the most vigorous seedlings

Technical Transplanting Parameters

In mechanical transplanting, trimming leaves and roots can make operations easier, but it may affect final yield.

30-40 days

From Nursery Sowing to Transplanting

10-15 cm

Approximate Seedling Height

4–5 true leaves

Ideal Transplanting Stage

Crown Above Ground Level

Avoid burying the crown to prevent compromising bulb development

Planting Density Based on Sowing Period

The optimal planting density is not fixed: it changes significantly depending on the sowing period and the climatic conditions expected during the crop cycle.
July–October

SUMMER SOWING:
85,000–90,000 plants per hectare

In summer, higher temperatures accelerate the crop cycle and promote smaller bulbs: a higher planting density compensates for the reduced size and optimizes yield per hectare.

November–May

AUTUMN–WINTER SOWING:
60,000–70,000 plants per hectare

In winter, the crop cycle is longer, giving plants more time to develop. Excessive planting density creates competition for light and nutrients, reducing bulb size and commercial quality.

To plan sowing correctly, also explore the fennel crop cycle and the ideal planting periods.
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Innovation in the Field: Technical Parameters of Precision Mechanical Sowing

Mechanical fennel sowing now relies almost exclusively on precision seeders, either pneumatic or mechanical with perforated discs, which pick up and place seeds individually at a constant spacing and depth.
A technology that has transformed crop management by reducing waste and improving emergence uniformity.
Parametri tecnici della semina meccanica del finocchio
Parametri tecnici

Semina meccanica di precisione del finocchio

Distanze e profondità di semina
ParametroSemina meccanica di precisione
Profondità del seme4-6 mm con seme confettato
Distanza tra le file40-60 cm
Distanza sulla fila6-15 cm, fino a 20 cm

Fennel Crop Rotation

An often underestimated aspect is crop rotation: rotations of at least two years are recommended, avoiding other Apiaceae crops after fennel because they share the same fungal diseases and pests. Instead, rotation with cereals such as durum wheat, barley, or maize is preferable. This helps manage the main threats affecting both crops, maintain soil fertility, and optimize the use of farm machinery throughout the year.
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Do You Grow Fennel on a Large Scale?

APOD provides agronomic technical support, certified plant material, and agricultural services, from soil preparation and mechanical sowing to crop rotation management.
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Frequently Asked Questions About Fennel Sowing

When Is Fennel Sown?
The fennel sowing period depends on the variety, growing area, and harvest schedule. In Italy, summer, autumn, and spring sowing are used to spread production throughout the year.
Direct sowing helps reduce time and costs, while transplanting is recommended for late production or smaller farms, where it can shorten the crop cycle and produce more uniform bulbs.
For summer sowing, the recommended density is 85,000–90,000 plants per hectare, while for autumn–winter sowing it is 60,000–70,000 plants per hectare.
Seedlings are generally transplanted 30–40 days after nursery sowing, when they have reached 10–15 cm in height and developed 4–5 true leaves.

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