When to Plant Lettuce UK

Growing Lettuce in the UK

Lettuce is one of the few crops I grow on a genuine rotation — small batches every few weeks rather than one big sowing I end up eating all at once. Get the timing right and you can cut fresh leaves from late spring well into winter; get it wrong and you either drown in lettuce for a fortnight or watch it bolt to bitter, useless stalks in the first proper heatwave. The truth is lettuce is easy to grow — what actually matters in the UK is when you sow, which varieties you pick for each part of the season, and how you handle the two things that ruin it here: heat-induced bolting and slugs. This guide covers the indoor and outdoor sowing windows, succession timing, and the regional adjustments that matter if you're not gardening in the mild South.

Amy Chapman

Founder & Head Grower, SoilCommander · RHS Level 2 · 12+ years growing in Yorkshire

I've been growing vegetables on my Yorkshire allotment and raised beds since 2012. Everything I write is based on what I've actually grown, failed at, and eventually got right in a real UK climate.

When to Plant Lettuce

Lettuce is remarkably flexible and can be grown almost year-round in the UK with the right varieties and protection:

Succession sowing strategy: Sow small amounts every 2-3 weeks from March to September for continuous harvests. This prevents gluts and ensures fresh lettuce throughout the season.

Sowing Lettuce Indoors

Starting Lettuce Indoors for Early Crops:

Indoor sowing gives you a head start on the season and protects young seedlings from slugs and adverse weather:

Indoor Sowing Method:

1. Fill modular trays or small pots with seed compost
2. Sow 2-3 seeds per module, barely covering with compost (lettuce needs light to germinate)
3. Water gently with a fine rose
4. Maintain temperature of 10-15°C for germination (germination occurs in 7-14 days)
5. Place in a bright location — windowsill or greenhouse
6. Thin to the strongest seedling per module once large enough to handle
7. Harden off for 7-10 days before transplanting outdoors when seedlings have 4-5 true leaves
8. Transplant 15-30cm apart depending on variety (check seed packet)

Sowing Lettuce Outdoors

Direct Sowing Outdoors:

Direct sowing is the most common method for lettuce, especially for cut-and-come-again varieties:

Direct Sowing Technique:

• Prepare a fine, weed-free seedbed by raking soil to a fine tilth
• Create shallow drills 1cm deep, rows 30cm apart
• Sow seeds thinly along the drill — aim for 2-3cm spacing
• Cover lightly with fine soil and water gently
• Thin seedlings progressively: first to 5cm, then to final spacing of 15-30cm depending on variety
• Use thinnings in salads — they're delicious!

Cut-and-Come-Again Method:

• Sow seeds more densely in wide drills or broadcast over a bed
• No thinning required
• Harvest leaves when 7-10cm tall by cutting 2-3cm above soil level
• Plants regrow for 2-3 more harvests
• Perfect for loose-leaf varieties like 'Salad Bowl' or mixed leaf blends

Harvesting Lettuce

Lettuce harvest timing varies by variety and growing method:

When to Harvest:

• Loose-leaf: Pick individual outer leaves as needed, or cut whole plant 2-3cm above soil for regrowth
• Hearting types: Harvest when hearts feel firm when gently squeezed
• Best time of day: Early morning when leaves are crisp and full of moisture
• Before bolting: Harvest promptly once mature — lettuce bolts (runs to seed) quickly in hot weather

Storage: Lettuce is best eaten fresh but can be stored in the fridge for 3-5 days. Wash and dry leaves, then store in a sealed container with kitchen paper to absorb moisture.

Growing Tips for the UK Climate

Additional UK-Specific Advice:

• Soil requirements: Lettuce prefers fertile, moisture-retentive soil with plenty of organic matter. pH 6.0-7.0 is ideal
• Feeding: Apply a nitrogen-rich liquid feed every 2 weeks for lush leaf growth, especially for cut-and-come-again crops
• Variety selection: Mix varieties for different textures, colours, and harvest times. Try 'Tom Thumb' (compact), 'Little Gem' (reliable), 'Lollo Rosso' (decorative), or 'Winter Density' (cold-hardy)
• Intercropping: Fast-growing lettuce is perfect for intercropping between slower crops like brassicas or sweetcorn
• Container growing: Lettuce grows excellently in containers, window boxes, or grow bags — ideal for small spaces and patios
• Winter protection: Grow winter varieties in unheated greenhouses, polytunnels, or under cloches for fresh salads in cold months
• Crop rotation: Rotate lettuce with other crop families to prevent soil-borne diseases
• Companion planting: Grow with radishes, carrots, or strawberries. Avoid planting near parsley which can inhibit growth
• Pest watch: Besides slugs, watch for aphids (spray with soapy water) and lettuce root aphid (rotate crops and improve drainage)

For sowing kit — modular trays, a fine rose, and a seedbed rake — browse our hand tools for gardening, and the soil and plant care range for feeds, mulches, and slug control.

See the Full Vegetable Planting Calendar

For a complete month-by-month guide to vegetable planting in the UK, visit our comprehensive Vegetable Planting Calendar. Plan your entire growing season for maximum productivity!