• a close up of pale green Calmar lettuce
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Calmar Lettuce Seeds by West Coast Seeds (Lactuca sativa)

Calmar Lettuce Seeds by West Coast Seeds (Lactuca sativa)

Calmar Lettuce Seeds by West Coast Seeds (Lactuca sativa) produce large, crisp heads with tightly layered pale green leaves and a mild, refreshing flavour. This crisphead (iceberg-type) variety is known for its improved heat tolerance and reliable head formation. This listing is for seed packets only and does not include live plants.

Lactuca sativa is a cool-season annual commonly grown for fresh salads and culinary use. ‘Calmar’ is a slow-bolting variety that performs well in warmer conditions compared to traditional iceberg lettuces. Plants develop dense, firm heads that are ideal for slicing, salads, and wraps.

This variety is well suited to garden beds, raised planters, and succession planting for continuous harvests.

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Sun Requirements ▾

Calmar lettuce performs best in full sun to partial sun. Strong sunlight supports firm head development, while light afternoon shade can help reduce heat stress during hotter periods. Insufficient light may slow growth and reduce leaf density.

Watering Instructions ▾

Maintain evenly moist soil to support consistent head formation and prevent bitterness. Water when the soil surface begins to dry, ensuring moisture reaches the root zone without creating overly saturated conditions. During warmer periods, more frequent watering may be required.

Care Tips ▾

Calmar lettuce grows best in fertile, well-draining soil enriched with organic matter. Stable soil structure and moderate humidity support steady growth, while its heat tolerance allows it to perform better than many lettuces in warmer temperatures. Good air circulation helps maintain healthy leaf development. Sow Calmar lettuce seeds directly outdoors in early spring once soil temperatures reach approximately 10–18°C, or succession sow through the growing season. Seeds typically germinate within 5–10 days. Heads are generally ready to harvest in about 60–70 days, or outer leaves may be harvested earlier for continuous production.
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