How to Grow Cabbage from Seed in South Africa

Cabbage grows best when the crop type, season and final spacing are matched. Gardening.co.za's six active products include compact red baby cabbage, four standard head cabbages and one upright Michihili-type Chinese cabbage. Chinese cabbage is a different crop group and must not inherit head-cabbage spacing or timing.

Baby Red Omero cabbage

Baby Red Omero is a compact red head cabbage. The current Gardening.co.za packet specifies 25 x 25 cm spacing for its baby-head outcome. A public Omero breeder page describes a lower commercial plant density and a longer growing period from planting, so this guide does not combine those figures or promise an exact weight or harvest day. Use the current packet spacing for compact heads and harvest when the head feels firm when gently squeezed.

Standard head cabbages

Cape Spitz, Copenhagen Market, Drumhead and Glory of Enkhuizen are Brassica oleracea head cabbages. Cape Spitz forms a pointed head; Copenhagen Market and Glory of Enkhuizen form round heads; Drumhead forms a broad, firm head. Their current packets specify 40 cm between plants and 60 cm between rows. South African production guidance allows wider spacing for larger heads, so keep the packet spacing for a practical home-garden baseline and widen towards 70 cm between plants or 90 cm between rows only when the cultivar, bed and desired head size justify it.

Chinese Michilli - upright Michihili-type Chinese cabbage

The product sold as Cabbage Chinese Michilli is an upright Michihili-type Chinese cabbage in the Brassica rapa Pekinensis Group, not B. oleracea head cabbage. Space plants about 30 cm apart with 45-60 cm between rows. Maintain uninterrupted growth in cool weather: heat, drought, root disturbance or a prolonged cold check followed by warmth can cause bolting or loose heads.

Seed form, light and pretreatment

Every exact product in this guide is currently sold as raw seed. Raw describes the physical seed form; it does not prove that a particular lot is untreated. The current labels specify 4 mm sowing depth and do not prescribe soaking, chilling or scarification. Sow the seed as supplied under a light layer of fine mix. No special light trigger is required while the covered seed germinates, but provide bright light and airflow as soon as seedlings emerge.

Always check the physical packet received for a lot-specific treatment warning. Do not use seed for sprouts or microgreens unless that packet explicitly confirms that the seed is untreated and suitable for food-sprouting use.

When to sow in South Africa

Winter-rainfall Western Cape

Sow from late summer into autumn for winter cropping, or in late winter for a spring crop. Use raised, well-drained beds during persistent winter rain. Protect young seedlings from snails, slugs and saturated soil, and finish spring heads before hot, drying weather.

Frost-prone interior

Sow in late summer for autumn establishment, or start trays under protection in late winter and plant out as severe frost eases. Established head cabbage tolerates cool conditions better than small seedlings. Protect Chinese cabbage from hard frost and avoid a prolonged cold check followed by rapid warming, which encourages bolting.

Humid coast and KZN Midlands

Use the cooler, less humid months. Give full morning sun, generous airflow and the correct module spacing. Water the soil early in the day rather than wetting leaves late. Inspect often for caterpillars, aphids, bacterial symptoms and leaf disease.

Hot-dry or subtropical interior

Plan the main crop for autumn and winter. Mulch after establishment and irrigate consistently, but keep water away from the crown. Extreme heat can prevent firm heading and can trigger bolting in Chinese cabbage; use light temporary afternoon protection only during establishment and do not replace full growing light with deep shade.

How to sow and transplant

1. Fill clean cells or a seed tray with fine, free-draining seedling mix and moisten it before sowing.
2. Sow one raw seed per cell 4 mm deep. For direct sowing, place seeds shallowly in a prepared seedbed and thin without disturbing the retained plant.
3. Keep the seed zone evenly moist, never saturated. Aim for 15-20 °C and expect emergence in about 7-14 days. Baby Red Omero's packet does not state a temperature; this temperature is a practical species-level tray target, not an Omero packet claim.
4. Move emerged seedlings into bright light with good airflow. Thin multi-sown cells to one strong seedling.
5. Transplant when seedlings are sturdy and have several true leaves. Harden them gradually for about a week.
6. Plant into damp soil late in the day or on a cool, overcast day. Set seedlings at the same depth as in the cell, firm gently and water immediately.
7. Use the spacing for the exact module. Do not apply Baby Red or standard head-cabbage spacing to Chinese Michihili.

Ongoing care

Choose full sun and fertile, well-drained soil. South African head-cabbage guidance uses a soil pH of about 5.5-6.8 and describes cabbage as a strong feeder. Add well-finished compost before planting and base additional fertiliser on a soil assessment where possible. Avoid excessive late nitrogen, which can delay firm heading.

Keep moisture steady while leaves and heads develop. Drought checks growth; a sudden heavy watering after a dry spell can split a firm head. Mulch without burying the stem. Rotate away from cabbage, kale, broccoli, cauliflower, radish and other brassicas, preferably for several seasons.

Inspect leaf undersides for diamondback moth larvae and other caterpillars, aphids, bagrada bugs, slugs and snails. Net young plants where practical. Use only controls registered for the exact edible crop, follow the label and observe the withholding period.

Harvest and kitchen outcome

Harvest Baby Red Omero and standard head cabbages when the head is firm for its type. Cut with a clean knife, keeping only sound wrapper leaves. Packet day ranges are planning guides and can shift with temperature, transplant stress, fertility, water and desired head size.

Harvest Chinese Michihili when the tall upright head is full and crisp, before heat or stress starts a flower stalk. Chill soon after cutting for best texture. All six products are edible vegetable crops, but seed itself is not food unless the received packet explicitly permits sprouting use.

Troubleshooting failed germination and establishment

• No emergence: the seed zone may have dried, become waterlogged, overheated or been buried too deeply. Re-sow 4 mm deep in fresh mix and verify that the packet was stored cool and dry.
• Seedlings collapse at soil level: damping-off is favoured by dirty containers, saturated mix, poor airflow and overcrowding. Remove affected seedlings and restart cleanly.
• Pale, stretched seedlings: provide brighter light immediately after emergence and avoid warm, crowded indoor conditions.
• No firm head: likely causes include heat, the wrong spacing, low fertility, drought checks or root damage.
• Chinese cabbage bolts: heat, drought or a prolonged cold check followed by warming can initiate flowering. Use a steadier cool-season window.
• Head splits: rapid water uptake after drought or delayed harvest is common. Keep watering even and harvest promptly at firmness.
• Holes in leaves: inspect for brassica caterpillars, slugs and snails and intervene while pests are small.
• Wilting, blackened veins or recurring root swell: remove affected plants, do not compost diseased tissue, improve drainage and rotate the bed. Seek local diagnostic advice before applying a treatment.

Shop cabbage seed

• Cabbage Baby Red Omero Seeds
• Cabbage Cape Spitz Seed
• Cabbage Copenhagen Market Seeds
• Cabbage Drumhead Seeds
• Cabbage Glory Of Enkhuizen Seeds
• Cabbage Chinese Michilli Seeds