Vegetables
Lettuce
A forgiving leafy crop that grows well in relatively shallow containers.
Lactuca sativa
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Photo: GT1976 / CC BY-SA 4.0
At a glance
- Difficulty
- beginner
- Maintenance
- low
- Time to harvest
- 30–50 days · from-seed
- Water need
- moderate
- Growth habit
- leafy rosette
- Indoor suitability
- good
- Support
- Usually not required
What this plant must have
These are minimum limits, not aspirational targets. Missing one can prevent healthy growth.
- Minimum direct light
- 3 hours
- Minimum container depth
- 12 cm (≈ 4.7 in)
- Minimum container volume
- 3 L (≈ 0.8 US gal)
- Active growth range
- 4–24 °C (≈ 39.2–75.2 °F)
- Frost behaviour
- tolerant
Conditions it prefers
These conditions improve performance, but there may be room to adapt within the hard limits above.
- Ideal direct light
- 4–6 hours
- Ideal temperature
- 7–21 °C (≈ 44.6–69.8 °F)
- Preferred depth
- 15–25 cm (≈ 5.9–9.8 in)
- Preferred volume
- 4–10 L (≈ 1.1–2.6 US gal)
- Drainage
- well drained
Overview
A forgiving leafy crop that grows well in relatively shallow containers.
What makes it practical
Sow thinly in a wide container and choose loose-leaf varieties for repeated small harvests.
What limits success
At least 3 hours of direct light; provide at least 12 cm of container depth and avoid treating the minimum as the preferred setup.
Getting started
Sow thinly in a wide container and choose loose-leaf varieties for repeated small harvests.
Before planting
Prepare a container with open drainage and enough volume for the plant's mature root system. The documented minimum is 3 litres.
Planting
Sow thinly in a wide container and choose loose-leaf varieties for repeated small harvests.
Position
Aim for 4–6 hours of direct light while watching for heat reflected from walls or glass.
Ongoing care
Keep the mix lightly moist and give afternoon protection when heat makes leaves limp or encourages bolting.
Watering check
This crop's water need is moderate. Check the mix itself instead of watering by a fixed weekday schedule.
Harvesting
Take outer leaves once they are useful size, leaving the center to continue growing.
Timing
The documented range is roughly 30–50 days from seed; temperature and cultivar can shift it.
Beginner mistakes
Crowded seedlings stay small and hold moisture around their leaves; thin them before they overlap heavily.
A useful reset
Change one condition at a time, then judge the newest growth rather than expecting damaged leaves to recover.
Troubleshooting context
Start with the visible symptom and rule out moisture, light, temperature, and root-room conflicts before assuming disease.
Relevant symptom
The launch troubleshooting library links this plant to wilting as a useful first diagnostic path.
Frequently asked questions
- How much light and root room does lettuce need?
Lettuce needs at least 3 hours of direct light. It needs a container at least 12 cm deep holding about 3 litres. A 15–25 cm container with 4–10 litres is easier to keep evenly watered. Expect roughly 30–50 days from seed, which shifts with temperature and cultivar.
Editorial review:
Reviewed by NookHarvest Editorial Team
How we review adviceCorrections and questionsProblems and next steps
Explore vegetables
Vegetables
Set up the container
Container Gardening
Choose pots, mix, drainage, and plant combinations that make small-space care more forgiving.
Troubleshoot a likely symptom
My Plant Keeps Wilting
Wilting can reflect dry roots, damaged wet roots, heat, or recent disturbance, so check the root zone before adding water.
Extreme Heat Stress
Scorched edges, rapid wilting, or stalled growth during hot weather
Could I Be Overwatering?
Wet soil, yellowing, soft growth, or fungus gnats
Something Is Eating the Leaves
Holes, bites, webbing, or sticky residue
Is My Plant Too Dry?
Light pot, dry mix, drooping, or crisp leaves
I’m Not Sure If I’m Watering It Right
Soil stays wet or dries too quickly
The Leaves Are Turning Yellow
Yellowing, fading, or pale leaves