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

Sowing

Direct sow in spring after last frost, or in late summer for fall crop. Can start indoors 4-6 weeks before planting for transplants

Cultivation

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

Appearance & flavour

Colour
Deep purple with green undertones
Shape
Broad leaves with gently scalloped margins
Flavour
Mild, delicate flavor with tender leaves suitable for fresh salads and preparations.

In the kitchen

Salads, baby leaf greens, fresh garnish, mixed green medleys

Pests, disease & resistance

Pests
Aphids, slugs, snails, flea beetles
Diseases
Downy mildew, lettuce mosaic virus, botrytis (gray mold)

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.

MarigoldsRepels nematodes and various garden pests through scent
BasilRepels aphids and whiteflies, may improve lettuce flavor
ChivesDeters aphids and other soft-bodied insects that damage lettuce
CarrotsDeep roots don't compete with shallow lettuce roots, maximizes space usage
RadishesQuick harvest frees space, helps break up soil for lettuce roots
NasturtiumsActs as trap crop for aphids and cucumber beetles
SpinachSimilar growing requirements and harvest timing, efficient space usage
GarlicNatural pest deterrent, repels aphids and slugs

Avoid

BroccoliLarge plants create excessive shade, stunting lettuce growth
FennelAllelopathic properties inhibit growth of most garden plants including lettuce
SunflowersTall plants create too much shade and compete heavily for nutrients

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 Garnet Giant?

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 Garnet Giant suits these too.

Browse all 110 lettuce