Lettuce

Family: Asteraceae

Genus: Lactuca

Species: sativa

History

Lettuce was cultivated by the ancient Egyptians and later by the Greeks and Romans, who developed several types. Its name comes from Latin 'lactuca', due to the milky sap. Lettuce reached Australia with European settlement and quickly became a garden favourite due to its short growing cycle and crisp leaves.

Sowing Calendar

Best Months to Plant – Lettuce
Climate ZoneJanFebMarAprMayJunJulAugSepOctNovDec
Cool/Mountain
Temperate
Arid
Subtropical
Tropical
Cool/Mountain – Lettuce
MethodJanFebMarAprMayJunJulAugSepOctNovDec
Start in trays
Plant out transplants
Direct sow
Temperate – Lettuce
MethodJanFebMarAprMayJunJulAugSepOctNovDec
Start in trays
Plant out transplants
Direct sow
Arid – Lettuce
MethodJanFebMarAprMayJunJulAugSepOctNovDec
Start in trays
Plant out transplants
Direct sow
Subtropical – Lettuce
MethodJanFebMarAprMayJunJulAugSepOctNovDec
Start in trays
Plant out transplants
Direct sow
Tropical – Lettuce
MethodJanFebMarAprMayJunJulAugSepOctNovDec
Start in trays
Plant out transplants
Direct sow

Where to Plant

Shady Spots & Herb Gardens

Shady Spots & Herb Gardens
• Areas receiving dappled or indirect sunlight, often near trees or buildings
• Best for shade-tolerant herbs like mint, parsley, or greens like spinach
• Helps prevent sun stress and conserves moisture
• Often used in cooler corners of the garden

Raised Garden Beds

Raised Garden Beds
• Enclosed garden beds elevated above ground level
• Offer excellent drainage and warmer soil conditions
• Reduce bending and make gardening easier for mobility-restricted gardeners
• Ideal for most vegetables, flowers, and herbs

Containers & Pots

Containers & Pots
• Portable planting vessels suited for patios, balconies, and small areas
• Provide complete control over soil composition and drainage
• Great for herbs, greens, compact vegetables, or ornamental plants
• Allow plants to be moved to follow sun, shade, or seasonal conditions

Pre-treatment

None Identified

There are no pre treatments required for germination.

Sowing Method

Direct Sow

• Sow seeds directly into prepared garden soil or outdoor containers
• Best for plants that dislike transplanting, such as root vegetables and beans
• Loosen soil and remove weeds before sowing
• Sow at the recommended depth and spacing, then water gently
• Keep the area moist until germination and thin seedlings if needed

Start in Trays

• Fill seed trays or punnets with quality seed-raising mix
• Sow seeds at the correct depth—refer to seed packet for guidance
• Place trays in a warm, sheltered location with good light
• Mist or bottom-water to avoid disturbing small seeds
• Transplant seedlings once they develop 2–4 true leaves

Surface Sow

• Sprinkle seeds on the surface of moist soil—do not cover
• Perfect for light-sensitive seeds like lettuce, petunias, and some herbs
• Press seeds gently into the surface to ensure good contact
• Cover with a humidity dome or cling wrap to retain moisture
• Mist regularly and keep in bright but indirect light until germination

Watering

High

• Requires consistently moist soil, particularly during warm or dry periods
• Best suited to shallow-rooted or leafy plants such as lettuces, leafy greens, and tropical herbs
• May need daily watering in hot, exposed locations or sandy soils
• Avoid letting soil dry out—wilting may occur quickly if moisture is lost
• Use mulch and drip irrigation to maintain even moisture levels

Fertilisation

Frost

Frost Tolerant

These plants can tolerate light to moderate frosts and may survive through cooler seasons.

Maintenance and Harvesting

Lettuce benefits from regular watering and partial shade in warmer months to prevent bolting. Harvest outer leaves frequently or cut entire heads at the base. Keep slugs and snails at bay with barriers or organic bait.

Pests and Diseases

Aphids

Aphids are tiny, soft-bodied insects that cluster on new growth and the undersides of leaves. They suck sap from plants, causing leaves to curl, yellow or become distorted. As they feed, they excrete sticky honeydew that encourages sooty mould, and colonies can build quickly in warm weather.

Start with organic controls: blast colonies off with a firm jet of water, encourage beneficial insects like ladybirds and lacewings, and spray neem oil or insecticidal soap to disrupt feeding. Keep plants well watered and avoid excess nitrogen that promotes soft growth. If pressure remains high, selective chemical sprays can be used sparingly, taking care to protect pollinators and beneficials.

Leaf spot

Leaf spot describes several fungal or bacterial diseases that create dark, often round lesions on foliage—sometimes with yellow halos. Severe infections cause premature leaf drop and reduced vigour, especially during warm, wet spells or when leaves stay damp.

Reduce spread by removing infected leaves, watering at the base, and spacing plants for airflow. Mulch to limit soil splash and rotate crops. Organic preventatives include copper and sulfur sprays applied early. If disease escalates, registered fungicides offer a chemical backup.

Downy mildew

Downy mildew causes pale yellow blotches on upper leaf surfaces with grey‑purple fuzz beneath, spreading fast in cool, moist weather. Heavily infected leaves collapse, slowing growth and yield.

Choose sunny, well‑ventilated positions, water early so foliage dries quickly, and remove infected leaves promptly. Organic options include copper and bio‑fungicides (phosphorous acid salts). For severe pressure, rotate chemical fungicide modes to prevent resistance.

Slugs & snails

Slugs and snails chew irregular holes in foliage and fruit and can wipe out seedlings overnight, especially in damp, sheltered spots.

Remove hiding places, water in the morning, and use beer traps, boards, or shelters to concentrate and hand‑pick. Copper barriers can deter them. For baits, iron‑based pellets are the safest organic option; use metaldehyde baits cautiously due to risks to pets and wildlife.

Damping off (seedlings)

Damping‑off is a soil‑borne disease that attacks seeds and seedlings, causing poor germination, sudden collapse, or pinched, water‑soaked stems at soil level. It thrives in cool, wet, stagnant conditions.

Sow into fresh, clean seed‑raising mix; avoid reusing contaminated trays. Provide warmth, light, and airflow; water lightly and allow the surface to dry between waterings. A light dusting of cinnamon or chamomile tea is a gentle organic measure; fungicidal drenches are rarely necessary for home growers when hygiene is good.

Sclerotinia (lettuce drop)

Sclerotinia (lettuce drop) can affect plant health and yields in home gardens. Typical symptoms include slowed growth, discolouration, and reduced productivity, often triggered by weather, nutrition, or cultural conditions.

Start with cultural fixes: rotate crops, improve soil with compost, water consistently, and choose resistant varieties. Organic sprays or amendments can reduce severity; chemical options are a last resort and should be used carefully and in accordance with labels.

Tipburn (physiological)

Tipburn (physiological) can affect plant health and yields in home gardens. Typical symptoms include slowed growth, discolouration, and reduced productivity, often triggered by weather, nutrition, or cultural conditions.

Start with cultural fixes: rotate crops, improve soil with compost, water consistently, and choose resistant varieties. Organic sprays or amendments can reduce severity; chemical options are a last resort and should be used carefully and in accordance with labels.

Growing Tips

• Lettuce is prone to bolting and bitterness in heat. To prevent this, sow at the right time of year and provide shade in hot conditions.
• Lettuce is prone to tipburn from rapid growth and calcium imbalance. Good cultural practices such as timely sowing, consistent care, and soil preparation can help manage this.
• Lettuce may develop loose heads in warm weather. Plant at the correct season and ensure even watering to encourage firm heads.

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