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How to Sow Swede seeds and Grow Swede in Ireland

swede seeds rutabaga seeds in ireland

A Complete Guide from Sowing to Harvesting Swede (Rutabaga) in Ireland

Swede (Brassica napus var. napobrassica), also known as rutabaga, is one of Ireland's most reliable winter vegetables. Hardy, productive and easy to store, swedes thrive in the Irish climate and provide a valuable harvest from autumn through to spring.

Often confused with turnips, swedes are larger, slower-growing and have distinctive yellow flesh with a sweet, earthy flavour that improves after exposure to frost.

Why Grow Swede?

Swedes are well suited to Irish gardens because they:

  • Tolerate frost and cold weather

  • Store well in the ground or in a cool shed

  • Produce high yields from a small area

  • Require relatively little maintenance

  • Provide fresh vegetables throughout winter

A single sowing can provide roots for many months, making swede an excellent crop for food security and self-sufficiency.

When to Sow Swede in Ireland

Timing is important when growing swedes.

In Ireland, direct sowing is usually carried out from April to mid-June, with May being the main sowing month. Sowing too early can increase the risk of plants bolting (running to seed) instead of producing large roots.

For most home gardeners, the ideal sowing window is:

Month Recommendation
April Early sowings possible
May Best month for main crop
June Still suitable, especially early June
July Usually too late for large winter roots

Late-May sowings can also help avoid the worst attacks from cabbage root fly.

Choosing a Site

Swedes prefer:

  • Full sun

  • Firm, moisture-retentive soil

  • Good drainage

  • A soil pH between 6.0 and 7.0

Avoid freshly manured ground. Excess nitrogen encourages rapid growth, which can lead to splitting and poor-quality roots.

As a brassica crop, swedes should be included in a crop rotation and not grown where cabbages, kale, broccoli or turnips were grown the previous year.

How to Sow Swede

Direct Sowing

  1. Prepare a fine, weed-free seedbed.

  2. Draw drills approximately 2 cm deep.

  3. Space rows 40 cm apart.

  4. Sow seeds thinly.

  5. Cover lightly with soil and water gently.

Seedlings usually emerge within 7–14 days, depending on temperature.

Thinning

Once seedlings are large enough to handle, thin them to:

  • 20–30 cm between plants

  • 40 cm between rows

Good spacing allows roots to develop fully and improves air circulation.

Watering and Feeding

Swedes are relatively undemanding but benefit from consistent moisture.

Watering

  • Water during prolonged dry spells.

  • Keep soil evenly moist during root development.

  • Avoid alternating drought and heavy watering, which can cause roots to crack.

Feeding

Swedes require only modest fertility.

If soil is poor, a balanced organic fertiliser can be applied before sowing. Avoid excessive nitrogen-rich feeds, which encourage leafy growth at the expense of root development.

Common Problems

Cabbage Root Fly

One of the most common pests affecting swedes in Ireland.

Symptoms include:

  • Wilting plants

  • Poor growth

  • Maggots feeding on roots

Protection:

  • Use insect-proof mesh or horticultural fleece.

  • Cover crops soon after germination.

Flea Beetle

Tiny holes appear in young leaves.

Protection:

  • Keep seedlings growing strongly.

  • Use insect mesh where necessary.

Clubroot

A soil-borne disease affecting brassicas.

Prevention:

  • Rotate crops.

  • Maintain a neutral soil pH.

  • Avoid infected ground.

When to Harvest Swede

Swedes are a slow-growing crop and generally take 15–24 weeks to mature, depending on sowing date and growing conditions.

Typical harvest times in Ireland are:

Sowing Date Harvest Period
April September onwards
May October onwards
June November onwards

Roots are ready when they reach approximately 10–15 cm in diameter, although many gardeners leave them longer for larger harvests.

Unlike many vegetables, swedes can remain in the ground throughout winter and be harvested as needed.

Storing Swede

Swedes are exceptionally good keepers.

In the Ground

In most parts of Ireland, mature roots can remain in the soil through winter and be lifted as required.

In Storage

Lift roots before prolonged freezing weather and:

  • Remove leaves

  • Brush off excess soil

  • Store in boxes of damp sand or peat-free compost

  • Keep in a cool, frost-free shed or garage

Stored correctly, swedes can remain in good condition for several months.

 

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