Carlton
Carlton is a compact head, upright foliage lettuce. Ready from roughly day 21. Germination takes 7-10 days. Space 8-12 inches apart. Full sun to part shade. This one is a hybrid: buy seed each season instead of saving it.

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
| Zone | Start indoors | Transplant | Direct sow | Harvest |
|---|---|---|---|---|
| 1 | — | — | June – July | June – September |
| 2 | — | — | May – July | June – September |
| 3 | — | — | May – June | May – October |
| 4 | — | — | April – June | May – October |
| 5 | — | — | April – May | May – November |
| 6 | — | — | April – May | April – November |
| 7 | — | — | March – May | April – November |
| 8 | — | — | March – April | March – December |
| 9 | — | — | February – March | February – December |
| 10 | — | — | January – March | February – December |
| 11 | — | — | January – February | January – December |
| 12 | — | — | January – February | January – December |
| 13 | — | — | January – February | January – December |
Companion planting
9 beneficial pairings indexed for this variety, 2 to avoid.
Avoid
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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Cultivar facts compiled from public horticultural references including USDA GRIN and NC State Extension. Descriptions are original to this catalogue.
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.
- Green 70 D Improved 21 days
- Red Kingdom 21 days
- Red Splendor 21 days
- Scarlet Frills 21 days
- Cheap Frills Mix 21 days
- Green Giant 21 days