Muir

Family: Asteraceae Leafy Green

Planting Schedule

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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.

Light: Part SunMaturity: 60 DaysHabit: Rosette

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Muir Planting Dates by USDA Zone

Estimated US hardiness-zone windows for sow, transplant, and harvest. Enter a US ZIP above for exact local dates, or open a zone below.

Zone	Start Indoors	Sow / Transplant	Harvest
Zone 1a	Protected Environment Only
Zone 1b	May 4th	Jun 1st	Jul 31st – Aug 1st
Zone 2a	Apr 27th	May 25th	Jul 24th – Aug 29th
Zone 2b	Apr 17th	May 15th	Jul 14th – Aug 25th
Zone 3a	Apr 17th	May 15th	Jul 14th – Sep 1st
Zone 3b	Apr 21st	May 19th	Jul 18th – Sep 21st
Zone 4a	Apr 17th	May 15th	Jul 14th – Sep 24th
Zone 4b	Apr 15th	May 13th	Jul 12th – Sep 27th
Zone 5a	Apr 10th	May 8th	Jul 7th – Sep 30th
Zone 5b	Apr 6th	May 4th	Jul 3rd – Oct 5th
Zone 6a	Apr 3rd	May 1st	Jun 30th – Oct 10th
Zone 6b	Mar 28th	Apr 25th	Jun 24th – Oct 16th
Zone 7a	Mar 23rd	Apr 20th	Jun 19th – Oct 20th
Zone 7b	Mar 13th	Apr 10th	Jun 9th – Oct 28th
Zone 8a	Mar 4th	Apr 1st	May 31st – Nov 5th
Zone 8b	Feb 23rd	Mar 23rd	May 22nd – Nov 12th
Zone 9a	Feb 6th	Mar 6th	May 5th – Nov 26th
Zone 9b	Jan 12th	Feb 9th	Apr 10th – Dec 9th
Zone 10a	—	Oct 1st	Nov 30th – Feb 28th
Zone 10b	—	Oct 1st	Nov 30th – Feb 28th
Zone 11a	—	Oct 1st	Nov 30th – Feb 28th
Zone 11b	—	Oct 1st	Nov 30th – Feb 28th
Zone 12a	—	Oct 1st	Nov 30th – Feb 28th
Zone 12b	—	Oct 1st	Nov 30th – Feb 28th
Zone 13a	—	Oct 1st	Nov 30th – Feb 28th
Zone 13b	—	Oct 1st	Nov 30th – Feb 28th

Crop Details

Trait	Value
Days to Maturity	60
Sun Requirements	Part Sun
Growth Habit	Rosette
Support Needed	None
Planting Depth	Normal
Germination Temp (°F)	70
Min Soil Temp (°F)	40
Min Night Temp (°F)	35
Harden Off (days)	5

Culinary Notes

Chef's Note

Muir’s Batavian rosette gives you a crisp, watery crunch with just enough sweetness to read “fresh” even when the dressing is bright. It’s the kind of lettuce that won’t collapse into the bowl—treat it gently and let lemony vinaigrettes and salty cheeses do the talking.

Best Uses

cold salads where you want crunch to stay loud after tossing
shaved-lettuce garnishes for tacos and grain bowls
quick lettuce cups for herby, acidic fillings
lightly dressed lettuce with minimal oil so it doesn’t go greasy

Flavor Profile

cool, mild sweetness clean green flavor crisp snap with tender ribs ruffled leaves that hold a light crunch

Kitchen Pairings

lemon extra-virgin olive oil feta goat cheese toasted almonds pickled shallots

Frequently Asked Questions

What’s the most common problem on Lactuca sativa (Muir) and how do I stop it?

A frequent issue on lettuce is downy mildew (often appearing as yellow patches on leaves with fuzzy growth on the underside). Improve airflow and avoid wetting the foliage, then remove and discard affected leaves early to slow spread. If it keeps recurring, use an appropriate labeled fungicide for lettuce/downy mildew and stick to a preventive schedule during cool, damp weather.

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.