SproutSmart
SproutSmart™ Intelligent Garden Sowing

Muir

Lettuce
Zone 11a Save Garden

Planting Schedule

Add Muir to your garden to build a schedule and get reminders.
Botanical illustration of Muir
60d to harvest

Silken, cool-toned leaves unfurl in a graceful Batavian rosette, offering a crisp snap and a refreshingly mild, sweet-green flavor that feels as clean as garden air. Muir’s sturdy heads hold their shape through the season, with a satisfying crunch from tender ribs to ruffled edges—ideal for fresh, leafy salads and vibrant garnishes. Grow Muir for dependable, 60-day harvests and a lush, market-ready presence in the bed.

Crop Dates

Growing note: In frost-free Zone 11a, grow this cool-season crop during the cooler dry season (October–February).
MilestoneDate
Start Indoors—
ClimateFrost-Free Climate
Transplant / Sow OutdoorsOct 1st
Harvest BeginsNov 30th
Harvest EndsFeb 28th

Crop Details

TraitValue
Days to Maturity60
Sun RequirementsPart SunPartial sun
Growth HabitRosette
Support NeededNone
Planting DepthNormal
Germination Temp (°F)70
Min Soil Temp (°F)40
Min Night Temp (°F)35
Harden Off (days)5

Today's Conditions

Outdoor planting for Muir in Zone 11a typically begins around 2026-10-01. Wait until soil reaches at least 40°F before transplanting Muir.

Garden Alerts

In frost-free Zone 11a, grow this cool-season crop during the cooler dry season (October–February).

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Frequently Asked Questions

How often should I water Muir lettuce during active growth, and what soil moisture level should I maintain?
During the main growing phase, keep the bed consistently evenly moist—aim for soil that feels like a wrung-out sponge 1–2 inches down. In typical conditions this is often about 1–2 deep waterings per week, but increase frequency during warm, windy weather to prevent leaf edge browning and bitterness. Avoid letting the soil dry out completely between waterings, because lettuce of Asteraceae type can turn stressed and bolt faster.
How can I tell when Muir (Lactuca sativa) is ready to harvest?
Harvest when heads/rosettes are firm and sized for the variety, typically around 60 days from sowing as a guide for Muir. Check the outer leaves: they should be fully expanded and crisp, not limp, and the plant should hold its shape with minimal give when gently pressed. If you see a tall central seed stalk forming, harvest immediately to get usable leaves before quality declines.
Botanical illustration of Muir

Silken, cool-toned leaves unfurl in a graceful Batavian rosette, offering a crisp snap and a refreshingly mild, sweet-green flavor that feels as clean as garden air. Muir’s sturdy heads hold their shape through the season, with a satisfying crunch from tender ribs to ruffled edges—ideal for fresh, leafy salads and vibrant garnishes. Grow Muir for dependable, 60-day harvests and a lush, market-ready presence in the bed.

Today's Conditions

Outdoor planting for Muir in Zone 11a typically begins around 2026-10-01. Wait until soil reaches at least 40°F before transplanting Muir.

Garden Alerts

In frost-free Zone 11a, grow this cool-season crop during the cooler dry season (October–February).

Sowing Tips

Soil Temperature

Direct sow or transplant when soil at planting depth holds 40°F for reliable germination and early growth.

Expert Note

For best crunch, keep plants evenly moist and shade slightly during the hottest spells since even heat-tolerant lettuce still performs best with consistent watering.