SproutSmart
SproutSmart™ Intelligent Garden Sowing

Concept

Lettuce
Zone 12a Save Garden

Planting Schedule

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

Cool, crisp leaves unfurl with a fresh, dewy snap—Concept delivers a summer-crisp bite that feels as clean as a morning breeze. The heads form with an inviting, tender texture and a balanced, mild flavor that shines in salads and bright garnishes. Grow Concept for reliable, garden-ready rosettes that hold their crisp appeal through warm-season days.

Crop Dates

Growing note: In frost-free Zone 12a, 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 DepthSurface
Germination Temp (°F)70
Min Soil Temp (°F)40
Min Night Temp (°F)35
Harden Off (days)6

Today's Conditions

Outdoor planting for Concept in Zone 12a typically begins around 2026-10-01. Wait until soil reaches at least 40°F before transplanting Concept.

Garden Alerts

In frost-free Zone 12a, grow this cool-season crop during the cooler dry season (October–February).

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Frequently Asked Questions

What pest or disease commonly affects Lactuca sativa (lettuce), and how do I manage it?
Lettuce commonly suffers from downy mildew (often showing as pale, yellow-green spots on leaves with fuzzy growth under humid conditions). Remove and discard infected leaves immediately, then space plants more widely for airflow and water at the soil line (not on leaves). If it keeps recurring, switch to a disease-resistant planting and consider a labeled fungicide that’s approved for lettuce and downy mildew in your area.
How often should I water Lactuca sativa during the main growing phase?
During the 60-day growth period, keep the top 1 inch of soil consistently moist but not waterlogged—lettuce roots are shallow and dry spells cause bitterness and bolting. In warm part-sun conditions, this often means watering 1–2 times per week, increasing to about every 2–3 days during hot spells. Mulch lightly after seedlings establish to steady moisture and reduce leaf-edge stress.
Botanical illustration of Concept

Cool, crisp leaves unfurl with a fresh, dewy snap—Concept delivers a summer-crisp bite that feels as clean as a morning breeze. The heads form with an inviting, tender texture and a balanced, mild flavor that shines in salads and bright garnishes. Grow Concept for reliable, garden-ready rosettes that hold their crisp appeal through warm-season days.

Today's Conditions

Outdoor planting for Concept in Zone 12a typically begins around 2026-10-01. Wait until soil reaches at least 40°F before transplanting Concept.

Garden Alerts

In frost-free Zone 12a, 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 summer crisp/butterhead types, keep soil evenly moist and use light shade or staggered sowings to delay bolting in heat.