Green and red lettuce varieties growing in a raised kitchen garden bed

Lettuce Grow Guide for South African Conditions

Lettuce is a fast, useful cool-season crop for South African kitchen gardens, but success depends on matching each type to a cool sowing window, shallow depth and steady moisture. This guide preserves the seven previously approved Batavia, iceberg, oakleaf and mesclun routes and adds six exact raw-seed products: Blond De Paris, Butterhead Attraction, Crisp Great Lakes, Little Gem, Lolla Rossa and Salad Bowl Red. The named single-cultivar lines are Lactuca sativa.

Quick Grow Facts

Crop: Lettuce, Lactuca sativa; the two approved mesclun products may include other salad leaves and herbs as stated on their own product pages.
Seed form: Blond De Paris, Butterhead Attraction, Crisp Great Lakes, Little Gem, Lolla Rossa and Salad Bowl Red are raw seed. Batavia, Iceberg Summer, Iceberg Winter and the two Large Oakleaf lines are pelleted. The mesclun products are raw seed.
Pretreatment: None for the six raw-seed additions; sow as supplied. Do not soak, scarify or chill them. Keep pelleted seed continuously moist until its coating softens; do not crush the pellet.
Best sowing time: Use the coolest practical window. Late summer through winter is strongest in winter-rainfall areas; late summer/autumn and late winter/early spring suit many frost-prone inland gardens; warm coastal and subtropical areas should concentrate on their cooler months.
Position: Full sun in cool weather; morning sun or light afternoon shade as temperatures rise.
Depth and light: The six raw-seed additions have an exact packet depth of 3 mm. Cover only with a fine 3 mm layer so light can still reach the shallow seedbed. Preserve the existing product-specific 5–10 mm directions for the approved products.
Germination: Keep the six raw-seed additions at about 15–20°C and allow their packet window of 7–14 days. Emergence falls in hot seedbeds; temperatures above about 27°C can inhibit lettuce germination.
Spacing: 30 × 30 cm for the six new packet-labelled lines when grown to full size. The approved guide routes retain 25–30 cm for heading Batavia/iceberg, 15–30 cm for oakleaf and closer rows or broad bands for baby-leaf mesclun.
Transplanting: Direct sow or raise in clean modules. Move tray seedlings when roots hold the plug and plants have several true leaves, commonly about four to five weeks after sowing. Harden gradually and keep the crown at soil level.
Care: Use fertile, moisture-retentive but freely drained soil. Lettuce has shallow roots; water regularly at soil level, avoid severe wet/dry swings and keep airflow open.
Harvest: The six new packets allow 60–90 days to harvest. Cut heading types when the head is firm for its type; pick clean outer leaves from looseleaf plants while leaving the centre intact; harvest before bolting turns leaves tough or bitter.

Exact Variety Modules

Batavia

A crisp, ruffled summer-crisp type supplied as pelleted seed. Grow it as a full head at about 25–30 cm spacing, or harvest selected outer leaves while the plant sizes up. The pellet coating must remain consistently moist while it softens.

Iceberg Summer

This pelleted crisphead line is the warmer-season iceberg option in the approved range, but it is not heat-proof. Soil temperatures above about 27°C can inhibit germination and sustained heat reduces head quality. Use the coolest practical sowing window, morning sun or light afternoon shade, mulch and steady moisture.

Iceberg Winter

Use this pelleted line for cool-season heading. Give plants full sun in cool weather, fertile soil, steady moisture and about 25–30 cm spacing. Avoid waterlogged winter beds and cut the large head when firm.

Oakleaf Large Green And Red

These pelleted looseleaf lines suit repeated outer-leaf picking. Space about 15–30 cm depending on whether you want baby leaves or larger plants, and leave the growing point intact for regrowth.

Mesclun Mixes

These approved raw-seed products are baby-leaf blends rather than heading lettuce. Sow their seed in shallow rows or broad bands according to the product directions and harvest young leaves above the crown for possible regrowth. Their approval does not establish the separate composition of Gourmet Salad Blend.

Blond De Paris — Batavia/crisphead

Exact scope: the packet-labelled Blond De Paris retail line, Lactuca sativa. It forms a large firm head with crisp light-green leaves. No breeder series is asserted.

Packet method: raw seed; no pretreatment; 3 mm; shallow light-favoured sowing; about 15–20°C; 7–14 days; 30 × 30 cm; 60–90 days. Direct sow thinly or sow one to two seeds per module, thin to one plant and transplant at several true leaves without burying the crown. Maintain steady moisture and harvest the full head when firm, before sustained heat triggers bolting.

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Butterhead Attraction — large butterhead

Exact scope: Attraction, Lactuca sativa, a large butterhead with tender light-green leaves and a slightly flattened firm head.

Packet method: raw seed; no pretreatment; 3 mm; shallow light-favoured sowing; about 15–20°C; 7–14 days; packet spacing 30 × 30 cm, consistent with a 25–30 cm variety range; 60–90 days. Transplant rooted plugs at several true leaves and keep growth uninterrupted. Irregular watering and heat increase bitterness and tipburn risk; cut the whole head before bolting.

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Crisp Great Lakes — crisphead/iceberg

Exact scope: the Great Lakes crisphead type, Lactuca sativa, grown for a compact, dense iceberg-style head. No narrower numbered Great Lakes strain is claimed.

Packet method: raw seed; no pretreatment; 3 mm; shallow light-favoured sowing; about 15–20°C; 7–14 days; 30 × 30 cm; 60–90 days. Use the coolest practical crop window and fertile, freely drained soil. Transplant without checking growth, water evenly through head formation and harvest the whole head when dense and crisp.

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Little Gem — compact cos/romaine

Exact scope: the packet-labelled Little Gem retail line, Lactuca sativa, a compact upright cos with a crisp sweet heart. No root-aphid resistance claim is made because the current evidence pack does not support it.

Packet method: raw seed; no pretreatment; 3 mm; shallow light-favoured sowing; use the family 15–20°C range; 7–14 days; 30 × 30 cm; 60–90 days. Transplant when the plug holds and several true leaves have formed, keeping the crown level. Harvest the compact heart when firm, or take only a limited number of clean outer leaves while the centre develops.

Shop Lettuce Little Gem Seed.

Lolla Rossa — red frilly looseleaf

Exact scope: the packet-labelled “Lolla Rossa” retail line, Lactuca sativa. It is scoped as a red frilly looseleaf lettuce; no breeder series or corrected cultivar spelling is inferred.

Packet method: raw seed; no pretreatment; 3 mm; shallow light-favoured sowing; about 15–20°C; 7–14 days; 30 × 30 cm for a full plant; 60–90 days. Direct sow and thin or transplant at several true leaves. Pick outer leaves cleanly while leaving the centre intact, or cut the mature rosette before hot weather drives bolting.

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Salad Bowl Red — red oakleaf-style looseleaf

Exact scope: the packet-labelled Salad Bowl Red retail line, Lactuca sativa, grown as a burgundy-red looseleaf rosette with oakleaf-style foliage. No breeder series is asserted.

Packet method: raw seed; no pretreatment; 3 mm; shallow light-favoured sowing; use the family 15–20°C range; 7–14 days; 30 × 30 cm for full rosettes; 60–90 days. Thin or transplant at several true leaves. Harvest young leaves or pick from full rosettes without damaging the centre; maintain even moisture to preserve mild texture.

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How To Sow Lettuce Successfully

Choose a cool window. Measure the seedbed or tray medium. Aim for about 15–20°C for the six raw-seed additions and avoid hot surfaces above about 27°C.
Prepare a fine surface. Use clean, fine, free-draining seedling mix or a level seedbed that will not crust. Pre-moisten and let excess water drain.
Sow at the exact depth. Cover the six raw-seed additions with only 3 mm of fine mix or vermiculite. Do not replace their packet depth with the broader depth used by other products. Place pelleted seed intact and follow its product directions.
Keep some light at the surface. Lettuce germination is light-favoured. A fine 3 mm cover protects moisture without creating a deep, dark layer. Do not put these trays in a blackout cupboard.
Hold moisture steady. Water with a fine rose or from below so small seed is not displaced. Keep the surface evenly moist but never saturated; pelleted seed must not dry hard before the coating softens.
Allow the full window. The six new packets specify 7–14 days. Do not disturb a clean, correctly cool tray early.
Give bright light after emergence. Remove humidity covers promptly, improve airflow and thin crowded seedlings before they stretch or develop damping-off.

Transplanting, Spacing And Ongoing Care

Direct-sown seedlings can be thinned to their final spacing; sound thinnings may be transplanted while still young. Tray seedlings are ready when roots hold the plug and several true leaves have formed, commonly at about four to five weeks. Harden them over several days, handle by a leaf or the plug, and plant with the crown at the same level as in the tray. A buried crown rots easily.

Give each of the six raw-seed additions 30 × 30 cm for full plants. Retain the approved product-specific spacing for the other routes. Use fertile loam or quality container mix with mature compost, good water-holding capacity and free drainage. Lettuce feeds near the surface, so weed shallowly and avoid root damage.

Water: Apply regular, lighter irrigation to the root zone and never let young plants dry out. Avoid late overhead watering where humidity or disease pressure is high.
Feed: Base fertiliser on soil or mix condition. Overfeeding with nitrogen produces soft growth and can increase disorder and disease risk.
Mulch: Use a light clean mulch after establishment to moderate heat and moisture, but keep it clear of the crown.
Airflow: Preserve spacing and remove badly damaged leaves. Raised beds help drainage and airflow in wet districts.
Support and pruning: None. Do not pinch heading lettuces. Looseleaf types are harvested by taking clean outer leaves without cutting the centre.

South African Regional Advice

Winter-Rainfall Western Cape

Late summer through winter is the most reliable window, extending into spring while weather stays cool. Use raised beds or containers where winter soil remains saturated, maintain airflow through wet periods and shelter seedlings from driving rain. As the dry season begins, irrigate consistently and protect plants from hot, desiccating wind.

Frost-Prone Interior

Use late-summer and autumn sowings, then a second protected late-winter sowing for transplanting as severe frost eases. Lettuce tolerates light frost better than heat, but hard frost can scorch mature leaves and heads. Protect small seedlings with fleece or a cold frame and keep dry winter beds irrigated; do not allow protected plants to overheat by day.

Humid Coast And KZN Midlands

Concentrate on the cooler, lower-humidity part of the year. Use morning sun, open spacing, raised or well-drained beds and early soil-level watering. Inspect for aphids, slugs, snails, downy mildew, leaf spots and soft rots. Remove failed material promptly and avoid crowding or wet foliage overnight.

Hot-Dry And Subtropical Interior

Sow through the coolest months and keep germination trays out of hot sun. Morning sun, light afternoon shade and mulch help moderate the shallow root zone. Establish plants before heatwaves, water deeply enough to wet the root zone and check containers daily in dry wind. Even heat-tolerant or summer-labelled lines can bolt, turn bitter or form poor heads in sustained heat.

Harvest And Food-Crop Hygiene

Harvest in the cool morning with clean tools. Cut crisphead, Batavia, butterhead and cos when the head or heart is firm for its type. Pick sound outer leaves from looseleaf plants while leaving the centre intact, or cut the whole rosette. Remove soil and damaged material, wash leaves in clean potable water before eating and refrigerate promptly. Do not eat treated seed; if a future lot carries a treatment warning, follow the packet exactly.

Troubleshooting Germination And Establishment

No germination: the seedbed was too hot, the surface dried, seed was covered too deeply or the seed is old. Correct temperature, 3 mm depth and moisture before trying any unlisted pretreatment.
Patchy emergence: check for uneven watering, crusted soil, clods, dry tray edges or one side of the tray heating in sun.
Pellets stay hard: the coating dried before it softened. Re-wet gently and consistently; do not crush the pellet or flood the tray.
Seedlings collapse: saturated mix, stagnant humidity, dirty equipment or crowding caused damping-off. Remove failures, vent, improve hygiene and reduce surface wetness.
Long pale seedlings: light was too weak after emergence. Move them gradually into brighter conditions and thin promptly.
Transplants stall: roots were disturbed, the crown was buried, hardening was skipped or conditions changed sharply. Keep the plug intact and growth uninterrupted.
No firm head: heading types are crowded, heat-stressed, underfed or irregularly watered. Restore 30 cm spacing, steady moisture and a cool season.
Brown leaf edges or tipburn: rapid growth, heat and uneven calcium movement during moisture stress are common contributors. Keep growth steady; do not assume more fertiliser will solve it.
Bitter leaves or a rising centre: the plant is bolting from heat, long days, age or water stress. Harvest immediately and resow in a cooler window.
Wilting in wet soil: roots or the crown may be rotting. Improve drainage, reduce watering frequency and remove badly affected plants.
Holes or missing seedlings: inspect at dusk for slugs, snails and cutworms. Use barriers, sanitation and only controls registered for the crop and problem in South Africa.
Sticky or distorted leaves: inspect for aphids and ants. Start with water rinsing, removal of badly infested leaves and airflow; follow a locally registered product label if treatment is required.
Spots, mould or soft decay: isolate affected plants, remove contaminated leaves, stop late overhead watering and improve airflow. Rotate out of the bed where disease persists.

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