How to Grow Muir
Lactuca sativa
Muir lettuce is a cool-season heirloom variety prized for its reliable growth in mild climates. Gardeners value this plant for its ability to tolerate light frosts while producing crisp leaves within fifty days of sowing.
📷 Wikipedia: LettuceStarting Muir: indoors or direct sow?
🌾 Sow directly in the garden — Muir is not usually started indoors.
Direct sow seeds outdoors two to six weeks before the last frost date; do not transplant seedlings as lettuce roots are sensitive to disturbance.
Soil, care & harvest
Prepare loose, fertile soil with a pH between 6.2 and 6.8 for optimal growth. As a cool-season crop, sow seeds directly outdoors two to six weeks before your last spring frost date. Press seeds gently into the soil surface at a depth of about one-quarter inch. Expect germination in seven to ten days under consistent moisture.
Space plants eight to twelve inches apart to ensure proper air circulation and head formation. Provide one to one-and-a-half inches of water weekly, keeping the soil consistently moist but not saturated. Apply a light layer of mulch around the base to retain moisture and suppress weeds. Feed lightly if growth slows in warmer weather.
Monitor for aphids, thrips, leafminers, and slugs; use row covers or hand-pick pests early. Watch for downy mildew, lettuce drop, and tip burn by ensuring good airflow and avoiding overhead watering. Harvest outer leaves when the plant reaches fifty days old, cutting them just above the base to encourage continued production.
When to Plant Muir
Planting windows vary by USDA hardiness zone. Look up yours by ZIP code.
| Zone | Start Indoors | Direct Sow | Harvest |
|---|---|---|---|
| Zone 1 | — | June – July | July – September |
| Zone 2 | — | May – July | July – September |
| Zone 3 | — | May – June | July – October |
| Zone 4 | — | April – June | July – October |
| Zone 5 | — | April – May | June – November |
| Zone 6 | — | April – May | June – November |
| Zone 7 | — | March – May | May – November |
| Zone 8 | — | March – April | May – December |
| Zone 9 | — | February – March | April – December |
| Zone 10 | — | January – March | March – December |
| Zone 11 | — | January – February | February – December |
| Zone 12 | — | January – February | February – December |
| Zone 13 | — | January – February | February – December |
Companion Plants for Muir
✓ Good companions
Repels aphids and whiteflies, may improve lettuce flavor
Helps loosen soil for lettuce roots and doesn't compete for nutrients
Repels aphids and other pests while taking up minimal space
Natural fungicide properties and aphid deterrent
Natural pest deterrent, repels aphids and nematodes
Acts as trap crop for aphids and adds beneficial insects
Attracts beneficial insects and doesn't compete aggressively
Quick-growing companion that helps break up soil and deters pests
Similar growing requirements and can be succession planted together
✗ Keep away from
Large leaves create excessive shade and compete for nutrients
Allelopathic properties inhibit growth of lettuce and most vegetables
Allelopathic compounds in roots can stunt lettuce growth
Nutrition Facts
Per 100g serving (USDA FoodData Central)
