Lettuce Iceberg Great Lakes - Unwins

Unwins Crisphead Lettuce Great Lakes is a heritage variety that produces large, crisp, and bright ...

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The Unwins Iceberg Great Lakes lettuce is an ideal choice for home gardeners looking for a reliable, heritage-style crisphead variety that excels in warm summer conditions. It provides large, crunchy, bright green heads that serve as the perfect base for fresh salads, though gardeners must be diligent about regular soil moisture levels to ensure the best leaf texture.

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FAQs

When is the best time to sow Unwins Great Lakes lettuce?

You can sow seeds from March through July for a harvest between May and September.

How deep should I plant the seeds?

Sow the seeds at a depth of 1 cm.

Can I grow this in containers?

Yes, provided the container is large enough to allow for the 25 cm spacing required for each head.

How often should I sow for a continuous supply?

Sow small batches of seeds every three weeks to ensure a steady supply of fresh lettuce throughout the summer.

Does this lettuce tolerate hot weather?

Yes, this variety is known for being bolt-resistant and performs better in heat than many other lettuce varieties.

Troubleshooting

Seeds are not germinating

Ensure the soil temperature is warm enough and keep the seedbed consistently moist, not waterlogged.

Plants are wilting in the afternoon sun

This is normal during extreme heat; however, ensure the soil is deeply watered in the morning to help the plant recover.

Heads are small or loose

Check that plants are spaced 25 cm apart; overcrowding prevents the heart from forming a tight head.

Pros and Cons

Pros

  • Excellent crunch and flavor
  • Strong resistance to bolting in summer heat
  • Large, reliable head size
  • Good disease resistance
  • Continuous harvest possible with staggered sowing

Cons

  • Requires consistent moisture to prevent bitter leaves
  • Specific spacing needed to prevent overcrowding
  • Not suitable for frost-prone late autumn or winter gardening

Setup, Compatibility & Care

To achieve the best results, sow your seeds approximately 1 cm deep. You may choose to start them in seed trays for transplanting or sow them directly into their permanent growing location.

Spacing: Ensure each plant is spaced at least 25 cm apart. This distance is critical for allowing the head to fully develop and ensures proper airflow to prevent fungal issues.

Moisture Management: The most vital aspect of care is maintaining constant soil moisture. Iceberg lettuce is water-intensive; if the soil dries out completely, the leaves may become bitter. Water in the early morning at the base of the plant to keep foliage dry and healthy.

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