American Flag Leek Seeds (Organic)

American Flag Leek is a classic heirloom variety treasured for its thick, tender stalks and mild, sweet onion flavor. This versatile vegetable adds depth and aroma to soups, stews, and sautés while serving as a milder alternative to traditional onions. Growing up to 12-15 inches tall, these leeks thrive in full sun and nutrient-rich, well-draining soil. They require a long growing season of about 120 days, making them ideal for fall or overwintering harvests in cooler climates. Known for their cold-hardiness, American Flag Leeks perform well in extended seasons and can even withstand frost.

Variety Details

• Botanical name: Allium ampeloprasum
• Plant type: Biennial
• Growth habit: Herbaceous
• Crop category: Onion
• Kitchen profile: American Flag Leek is a classic heirloom variety treasured for its thick, tender stalks and mild, sweet onion flavor.
• Recorded feature: Open-Pollinated
• Product format: Seed packet with a separately listed bulk option

Sowing & Growing

• Soil Temperature: 60-80°F
• Planting Depth: 1/4"
• Germination: 5-12 Days
• Height At Maturity: 15"-20"
• Days to Maturity: 130
• Sun/Shade: Full Sun
• Spacing After Thinning: 6"

Sow American Flag Leek according to the local cool-season window and the recorded starting method. Give seedlings strong light when started indoors, then transplant or thin them to the listed spacing. Keep weeds from competing with the narrow foliage and evaluate soil moisture at root depth rather than using a universal schedule. Harvest leaves, stems, or mature bulbs according to the crop type. For storage types, allow curing after the neck and outer layers reach an appropriate stage.

The plants have a compact, upright growth habit, making them suitable for small gardens or interplanting with other crops.

With their easy cultivation, long harvest window, and delicious flavor, American Flag Leeks are a useful addition to any vegetable garden, offering a gourmet touch to your culinary creations.

Before sowing American Flag Leek, review the packet alongside the current product details and note any range in temperature, germination, or maturity. Ranges reflect biological and seasonal variation rather than a fixed promise. Label each planting with its date and location, then compare emergence, growth, and harvest with local weather. This record is useful for succession plantings and for deciding whether the crop fits better into an earlier or later seasonal window.

Explore related options in our Leek Growing Guide.