Iceberg Crisphead Lettuce
Lactuca sativa
Seeds per pack ~150
Germination: 93% Oct 2025 (Packed for 2026)
Origins and History
Iceberg crisphead lettuce (Lactuca sativa) descends from wild lettuces native to the Mediterranean and West Asia, where early farmers selected plants for larger, less-bitter leaves and tighter “headed” forms over many generations. While lettuce has ancient roots, crisphead types are a later domestication milestone—bred for dense, crunchy heads that could handle transport and storage better than loose-leaf lettuces. “Iceberg” became a well-known crisphead style in the United States as growers and shippers favored its firm heads, mild flavor, and durability—traits that made it a staple market lettuce and a classic garden variety for cool-season growing.
Appearance and Characteristics
Iceberg (crisphead) forms a tight, round head with pale green outer leaves and a very crisp, watery crunch. Leaves are smooth to lightly ruffled at the edges, with a clean, mild taste and low bitterness when grown in cool conditions. The dense head resists wilting and holds well after harvest compared with many tender lettuces. In heat stress, plants may bolt (send up a flower stalk) and can become more bitter, so timing and temperature are key.
Culinary Uses
Iceberg is prized for crunch and freshness rather than strong flavor. It’s ideal for chopped salads, wedge salads, tacos and sandwiches, lettuce wraps, burgers, and as a crisp base for creamy dressings. The sturdy leaves also work well for quick pickling, slaws, or layering into sandwiches where you want texture without overpowering other ingredients.
Growing Tips
Iceberg is a cool-season crop that performs best when days are mild and nights are cool.
- When to plant: Sow in early spring as soon as soil can be worked, or again in late summer for a fall crop. In warmer regions, aim for spring/fall windows and use light shade cloth if heat arrives early.
- Soil: Loose, fertile, moisture-retentive soil with plenty of compost produces the sweetest, crispest heads. Consistent moisture prevents bitterness and tip burn.
- Spacing: Thin or transplant to about 10–12 inches apart (more space helps heads size up evenly).
- Water: Keep evenly moist—avoid drought stress followed by heavy watering, which can cause uneven growth and quality issues.
- Heat management: Mulch to cool the soil and water in the morning. If temperatures spike, provide afternoon shade to reduce bolting.
- Pests: Watch for aphids, slugs, and rabbits. Floating row cover early on helps; hand-pick slugs and keep beds tidy.
Sow Depth
Sow seed very shallow—about 1/8 inch deep (or simply press into the surface) because lettuce needs light to germinate well. Keep the seedbed consistently moist until emergence. Ideal germination happens in cool soil; if it’s warm, start seeds indoors or chill the soil surface with frequent light watering.
Harvesting Guidance
Harvest iceberg when heads feel firm and full—squeeze gently; they should be tight, not airy. Cut at the base with a clean knife in the cool morning, leaving the wrapper leaves on for protection. For the best crunch, cool quickly after harvest (rinse, drain well, and refrigerate). If you see a tall central stalk forming, harvest immediately—bolting reduces head quality and increases bitterness.
