Winter Density

Lettuce

55d to harvest

Winter Density delivers a crisp, cool-sweet crunch with a dense, upright head that holds its shape through chilly weather. Its leaves are richly textured—deep green and pleasantly firm—ideal for gardeners who want reliable, harvest-ready foliage at day’s end in winter. Grow Winter Density for fresh, sturdy romaine-style salads and for lush, full-bodied greens that stay attractive and crisp after picking.

Crop Dates

Milestone	Date
Start Indoors	Mar 23rd
Last Frost	Apr 20th
Transplant / Sow Outdoors	Apr 20th
Harvest Begins	Jun 14th
Harvest Ends	Oct 20th

Crop Details

Trait	Value
Days to Maturity	55
Sun Requirements	Part Sun
Growth Habit	Rosette
Support Needed	None
Planting Depth	Normal
Germination Temp (°F)	45
Min Soil Temp (°F)	40
Min Night Temp (°F)	30
Harden Off (days)	6

Frequently Asked Questions

What pest or disease most commonly affects Lactuca sativa in winter, and what should I do?

Winter lettuces (Lactuca sativa) often suffer from downy mildew (often worsens with cool, wet weather) and slugs/snails when nights stay damp. Improve airflow by spacing plants and removing lower leaves that touch soil, then water early in the day so foliage dries before night. If mildew shows, avoid overhead watering and remove affected leaves; for severe outbreaks, use a labeled fungicide that lists downy mildew on lettuce and follow the label’s intervals.

How often should I water Lactuca sativa during the main growing period in winter?

Keep lettuce evenly moist through the 55-day grow-out—aim for soil that stays consistently damp but not soggy. In winter, this usually means watering about once or twice per week, with the frequency adjusted to rainfall and how quickly the bed dries; check by pressing a finger 1–2 inches into the soil. If it feels dry at that depth, water thoroughly until the top 6 inches are moist, then let the surface lightly dry before the next watering.

How can I tell when Winter Density (Lactuca sativa) is ready to harvest?

Harvest when heads/rosettes reach full size for your planting and the leaves feel firm instead of floppy, typically around 55 days from sowing. Look for crisp, thickened leaf texture at the base and a tight, well-formed crown; avoid waiting until the center starts stretching or flowering. For peak quality, harvest in the morning and cool immediately, especially if temperatures rise above the cool-season range.