How to grow swede
Overview
Swede (Brassica napus var. napobrassica) is a cool-season root vegetable grown for its large, sweet-flavoured bulbs. It requires consistent moisture and cool temperatures to develop tender roots without becoming woody.
Varieties
- Champion — A popular purple-top swede with smooth skin and sweet, creamy flesh, reliable in cool climates.
- Marian — A high-yielding variety with good resistance to clubroot, suitable for temperate and cool zones.
- Helenor — A late-maturing swede with excellent storage qualities and mild flavour.
Soil Preparation
Swede prefers deep, well-drained soil with a pH of 6.0–7.0. Enrich with well-rotted compost or aged manure before planting. Avoid freshly manured soil to prevent root forking.
Growing Guide
Sow swede seeds directly into well-drained, fertile soil in full sun. Plant seeds 1 cm deep, 15 cm apart in rows 30 cm apart. Thin seedlings to 20–25 cm apart once they reach 10 cm tall. Keep soil consistently moist, especially during root swelling. Avoid transplanting to prevent root disturbance.
Sowing
Sow seeds directly into the garden bed at 1 cm depth, spacing seeds 15 cm apart in rows 30 cm apart. Germination takes 5–10 days. Thin to 20–25 cm apart once seedlings are established. Direct sowing is preferred over transplanting.
Care
Apply a potassium-rich fertiliser (e.g., sulphate of potash) when roots begin to swell. Avoid high-nitrogen feeds after root formation to prevent forking. Remove yellowing lower leaves to improve air circulation and reduce disease.
Companion Planting
Good companions include peas, beans, onions, and potatoes. Avoid planting near other brassicas like cabbage, broccoli, and kale to reduce pest and disease pressure.
Common Pests & Risks
Cabbage white caterpillars can be controlled with netting or Bacillus thuringiensis. Aphids and flea beetles may be managed with insecticidal soap or diatomaceous earth. Rotate crops to reduce soil-borne diseases like clubroot.
Harvesting
Harvest swede roots when they reach 8–12 cm in diameter, typically 12–16 weeks after sowing. Lift roots gently with a fork, trim tops, and store in a cool, dark place. Smaller roots are sweeter and more tender.
In the Kitchen
Swede can be roasted, mashed, or added to soups and stews. Peel before cooking as the skin is tough. Store in a cool, dark place for up to several months.
Troubleshooting
Root forking: caused by high nitrogen or stony soil; avoid fresh manure and remove stones. Woody roots: due to hot weather or delayed harvest; plant early and harvest promptly. Yellow leaves: nitrogen deficiency or overwatering; feed with balanced fertiliser and improve drainage. Small roots: overcrowding or poor soil; thin seedlings and enrich soil. Pests: cabbage white caterpillars and aphids; use netting or insecticidal soap.