Lettuce
50days to harvest
7-10days to germinate
Z2–11USDA zones
Moderatedifficulty
HeirloomContainer friendly

Sowing

Direct seed or start indoors. Can be planted later in spring than most lettuce varieties. Excellent for summer succession planting.

Cultivation

Sun
Full sun to partial shade (4-6+ hours)
Water
1-1.5 inches per week, consistent deep watering
Soil
Rich, well-drained soil with high organic content
Soil pH
6.2-6.8
Spacing
8-12 inches
Height
6-12 inches
Season
Warm season annual

Appearance & flavour

Colour
Medium green outer leaves with pale yellow-green hearts
Size
6-8 inches across, 4-6 inches tall
Shape
Dense, rounded butterhead with cupped leaves
Flavour
Sweet, buttery, and tender with delicate texture

In the kitchen

Gourmet salads, lettuce cups, sandwiches, fresh eating

Pests, disease & resistance

Pests
Aphids, thrips, leafminers, slugs
Diseases
Downy mildew, lettuce drop, tip burn
Resistance
Downy Mildew (EU) races 16-26, 28, 32 (High); Downy Mildew (US) races 5-9 (High); Lettuce Leaf Aphid Nasonovia ribisnigri (High); Lettuce Mosaic Virus (Intermediate); Tomato Bushy Stunt Virus (High)

Planting calendar by USDA zone

ZoneStart indoorsTransplantDirect sowHarvest
1——June – JulyJuly – September
2——May – JulyJuly – September
3——May – JuneJuly – October
4——April – JuneJuly – October
5——April – MayJune – November
6——April – MayJune – November
7——March – MayMay – November
8——March – AprilMay – December
9——February – MarchApril – December
10——January – MarchMarch – December
11——January – FebruaryFebruary – December
12——January – FebruaryFebruary – December
13——January – FebruaryFebruary – December

Companion planting

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

BasilRepels aphids and whiteflies, may improve lettuce flavor
ChivesRepels aphids and other pests while taking up minimal space
CarrotsHelps loosen soil for lettuce roots and doesn't compete for nutrients
RadishesQuick-growing companion that helps break up soil and deters pests
MarigoldsNatural pest deterrent, repels aphids and nematodes
SpinachSimilar growing requirements and can be succession planted together
GarlicNatural fungicide properties and aphid deterrent
NasturtiumsActs as trap crop for aphids and adds beneficial insects
ParsleyAttracts beneficial insects and doesn't compete aggressively

Avoid

BroccoliLarge leaves create excessive shade and compete for nutrients
FennelAllelopathic properties inhibit growth of lettuce and most vegetables
SunflowersAllelopathic compounds in roots can stunt lettuce 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

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 Muir?

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 Muir suits these too.

Browse all 110 lettuce