Mighty Joe

Lettuce

Zone 5a Save Garden

🌱 65d to harvest Rosette

Crisp as morning frost, Mighty Joe forms a tight, upright crisphead with a cool, buttery crunch and a clean, sweet-green flavor. …

Crop Dates

Milestone	Date
Start Indoors	Apr 10th
Last Frost	May 8th
Transplant / Sow Outdoors	May 1st
Harvest Begins	Jul 5th
Harvest Ends	Sep 30th

Crop Details

Trait	Value
Days to Maturity	65
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)	6

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Frequently Asked Questions

What pests or diseases commonly hit Lactuca sativa (leaf lettuce), and what should I do if I see them?

Watch for aphids and slugs/snails, which commonly damage tender Lactuca sativa foliage. Spray a strong jet of water to knock off aphids and use an iron-phosphate slug bait around plants in the evening, then remove heavily damaged leaves. In warm, humid weather, lettuce can develop downy mildew or leaf spot—space plants for airflow and water at the soil line instead of overhead to keep leaves drier.

How often should I water Lactuca sativa during the main growing phase?

During active growth, keep the root zone consistently moist but not waterlogged—water when the top 1 inch of soil feels dry. In typical home gardens, this often means about 1 inch of water per week total, split into 2–3 waterings during hot spells to prevent lettuce from drying out and bolting. Avoid letting the soil swing between very dry and very wet, since that stresses lettuce and worsens tip burn.

How can I tell when Lactuca sativa ‘Mighty Joe’ is ready to harvest at about 65 days?

Harvest when heads/rosettes feel firm and filled out, with outer leaves reaching their expected size and color; don’t wait for leaves to become loose or overly tough. For crisp leaf/mini-head types of Lactuca sativa, you can begin “cut-and-come-again” harvesting by removing outer leaves once plants are well-developed, or harvest the whole plant when it holds together firmly. Use the days-to-maturity as a guide, but confirm readiness by the plant’s firmness and leaf size rather than the calendar alone.

Crisp as morning frost, Mighty Joe forms a tight, upright crisphead with a cool, buttery crunch and a clean, sweet-green flavor. At maturity it delivers dense, spoon-bright leaves that hold their snap—ideal for refreshing salads and vibrant platters, as well as quick-chill freshness straight from the garden. Grow it for a dependable 65-day rhythm and a satisfying, long-lasting crisp you’ll want to show off at the table.