Lettuce
21days to harvest
7-10 daysdays to germinate
Z8–11USDA zones
Easydifficulty
Heirloom

Sowing

Direct sow after last frost, or start indoors 4-6 weeks before last frost

Cultivation

Sun
Full sun to partial shade (4-6+ hours)
Water
High — consistent moisture needed
Soil
Well-drained loam, rich in organic matter
Spacing
6-12 inches
Height
12-18 inches
Season
Warm season annual

Appearance & flavour

Colour
Deep red with burgundy tones
Shape
Loose leaf rosette
Flavour
Hot, mustardy peppery flavor with a bold, distinctive taste.

In the kitchen

Fresh salads, salad mixes, garnishes, heat-resistant summer greens

Pests, disease & resistance

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

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

8 beneficial pairings indexed for this variety, 3 to avoid.

ChivesRepels aphids and improves lettuce flavor with aromatic compounds
CarrotsLoose soil cultivation benefits lettuce roots, different root depths prevent competition
RadishesQuick harvest breaks soil for lettuce, acts as trap crop for flea beetles
MarigoldsRepels nematodes and aphids, attracts beneficial predatory insects
SpinachSimilar growing requirements and shade tolerance, efficient space utilization
GarlicDeters slugs and aphids with strong sulfur compounds
NasturtiumsActs as trap crop for aphids and cucumber beetles, edible flowers add color
DillAttracts beneficial insects like ladybugs and lacewings that control aphids

Avoid

BroccoliHeavy feeder that competes for nitrogen and can shade out lettuce
SunflowersAllelopathic chemicals inhibit lettuce germination and growth
FennelStrong allelopathic properties inhibit growth of most vegetables including lettuce

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

Some links are affiliate links. If you buy through them we may earn a commission at no extra cost to you.

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 Red Splendor?

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 Red Splendor suits these too.

Browse all 110 lettuce