Concept

Lettuce

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

Milestone	Date
Start Indoors	Mar 23rd
Last Frost	Apr 20th
Transplant / Sow Outdoors	Apr 20th
Harvest Begins	Jun 19th
Harvest Ends	Oct 20th

Crop Details

Trait	Value
Days to Maturity	60
Sun Requirements	Part Sun
Growth Habit	Rosette
Support Needed	None
Planting Depth	Surface
Germination Temp (°F)	70
Min Soil Temp (°F)	40
Min Night Temp (°F)	35
Harden Off (days)	6

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.

How can I tell when Lactuca sativa is ready to harvest?

Harvest when heads are firm and appropriately sized for your type, or when outer leaves are full-sized (typically around 60 days from sowing). For loose-leaf lettuce, pick outer leaves once they’re large enough to use and leave the center to keep growing. If you see rapid stem elongation or flowering stalk development, harvest immediately—lettuce will turn bitter as it bolts.