Lettuce
21days to harvest
7-10 daysdays to germinate
Z5–9USDA zones
Easydifficulty
F1 hybrid

Sowing

Direct sow or transplant seedlings started indoors 3-4 weeks before planting. Can sow every 2 weeks for continuous harvest.

Cultivation

Sun
Full sun to part shade
Water
High — consistent moisture needed
Soil
Well-drained loam, slightly acidic to neutral pH
Spacing
8-12 inches
Height
3 feet
Season
Warm season annual

Appearance & flavour

Colour
Light green
Shape
Compact head, upright foliage
Flavour
Mild, tender, and crisp with a subtle sweetness; versatile for both raw and cooked applications.

In the kitchen

Salads, steamed with soy sauce, stir-fries, soups, braising, baby leaf stage salads

Pests, disease & resistance

Pests
Aphids, slugs, snails, flea beetles
Diseases
Downy mildew, lettuce mosaic virus, tipburn

Planting calendar by USDA zone

ZoneStart indoorsTransplantDirect sowHarvest
1——June – JulyJune – September
2——May – JulyJune – September
3——May – JuneMay – October
4——April – JuneMay – October
5——April – MayMay – November
6——April – MayApril – November
7——March – MayApril – November
8——March – AprilMarch – December
9——February – MarchFebruary – December
10——January – MarchFebruary – December
11——January – FebruaryJanuary – December
12——January – FebruaryJanuary – December
13——January – FebruaryJanuary – December

Companion planting

9 beneficial pairings indexed for this variety, 2 to avoid.

ChivesRepels aphids and other soft-bodied insects that damage lettuce
MarigoldsDeters nematodes and aphids while attracting beneficial insects
CarrotsDeep roots don't compete with shallow lettuce roots, good space utilization
RadishesBreak up soil for lettuce roots and mature quickly as companion crop
GarlicNatural fungicide properties help prevent lettuce diseases like downy mildew
SpinachSimilar growing requirements and can provide shade for lettuce in warm weather
NasturtiumsTrap crop for aphids and cucumber beetles, acts as living mulch
DillAttracts beneficial insects like ladybugs that prey on lettuce pests
ParsleyAttracts beneficial insects and doesn't compete heavily for nutrients

Avoid

BroccoliCompetes for nutrients and space, can shade out lettuce with large leaves
SunflowersAllelopathic compounds inhibit lettuce germination and growth

Nutrition (per 100 g)

Protein (g)
0.742
Fat (g)
0.0738
Carbohydrate (g)
3.37
Vitamin K (µg)
20.5
Vitamin B6 (mg)
0.0401
Calcium (mg)
14.2
Iron (mg)
0.0332
Magnesium (mg)
6.31
Phosphorus (mg)
19.2
Potassium (mg)
139
Zinc (mg)
0.173

Where to buy seed and equipment

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Growing it? There is a full cultivation guide at the lettuce growing guide.

Cultivar facts compiled from public horticultural references including USDA GRIN and NC State Extension. Descriptions are original to this catalogue.

DarkGrow forum

Grown Carlton?

Post a crop report — day counts, reservoir readings, what worked. Variety-specific logs are the most useful thing on the forum.

Similar varieties

Other lettuce with a comparable time to harvest, so a season that suits Carlton suits these too.

Browse all 110 lettuce