Summer Bibb

Lettuce

55d to harvest

Cool, crisp leaves unfurl in a tight, butter-soft head—Summer Bibb delivers a fresh, sweet green crunch with a tender, succulent bite. The pale chartreuse heart stays delicately mild while the outer leaves hold a satisfying snap, making this crisphead ideal for fresh salads and elegant garnish. Grow it for dependable midseason performance and a clean, refined texture that shines in every bowl.

Crop Dates

Growing note: In frost-free Zone 13b, grow this cool-season crop during the cooler dry season (October–February).

Milestone	Date
Start Indoors	—
Climate	Frost-Free Climate
Transplant / Sow Outdoors	Oct 1st
Harvest Begins	Nov 25th
Harvest Ends	Feb 28th

Crop Details

Trait	Value
Days to Maturity	55
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)	7

Frequently Asked Questions

What pest or disease problem is most likely on Lactuca sativa (Summer Bibb), and how do I manage it?

Bibb lettuces commonly suffer from downy mildew (often showing yellow-green patches on leaves with grayish growth underneath) in cool, humid weather. Remove and discard affected leaves early, space plants for airflow, and avoid wetting foliage when watering; use drip irrigation if possible. If problems persist, use an appropriate labeled fungicide for lettuce/downy mildew and follow label timing closely to protect heads before harvest.

How often should I water Summer Bibb during the main growing phase?

Keep the root zone evenly moist from transplanting through head formation—aim for consistently damp soil, not puddled. In warm midsummer growth (when Bibb is actively forming heads), this often means watering every 2–4 days depending on your soil and heat, with more frequent checks during dry windy spells. Lettuce develops bitter, loose heads if it swings between dry and wet, so water deeply enough to reach the root zone each time.

How can I tell when Summer Bibb (Lactuca sativa) is ready to harvest?

Harvest at about 55 days when heads feel firm and well-formed, with leaves that are crisp and tightly gathered but still tender. Look for a compact, butterhead-style “bibb” shape rather than an airy clump, and cut in the morning for best texture. If leaves start to loosen and the center elongates, it’s over-maturing—harvest immediately to avoid bitterness.