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American Flag Leek — also known as Scotch Flag and Giant Musselburgh — is a classic Scottish heirloom introduced in the 1830s and still one of the finest leeks available. Very winter-hardy blue-green stalks grow 7–10 inches long and 1½ inches in diameter, with a delicious, sweet, mild onion flavor that makes them exceptional in soups, stews, stir-fries, and salads. A standard variety for home and market gardeners because it grows very uniformly — beautiful, consistent harvests every time. Hardy to Zone 3, biennial grown as an annual. 130 days.
Start indoors 10–12 weeks before last frost. Sow seeds ⅛ inch deep in fertile, well-draining soil. Transplant outdoors after last frost, spacing plants 6 inches apart in rows 12 inches apart in full sun. Transplant into deep holes or trenches and backfill gradually to blanch the stalks white. Water consistently. Harvest when stalks reach desired size — leeks can be left in the ground through light frosts for extended harvest.
| Days to Maturity | 130 days |
| Stalk Size | 7–10 inches long, 1½ inches diameter |
| Color | Blue-green tops, white blanched stalks |
| Flavor | Sweet, mild onion |
| Also Known As | Scotch Flag, Giant Musselburgh |
| Heritage | Scottish heirloom, introduced 1830s |
| Type | Heirloom, Open-Pollinated, Non-GMO, Biennial grown as annual |
| USDA Zones | 3–9 |
Packed and shipped by Box Garden Seeds LLC — heirloom seeds grown without GMOs, selected for flavor, resilience, and your garden’s success.
I cant wait to plant them.
Love this carrot, beautiful color and tasty
Very happy with the product.
Excellent experience. It was absolutely a joy throughout the whole process. I'm very grateful.
Not everyone sells these and I absolutely love them in my summer salads! Thanks for offering them!!!
So happy to get these seeds for my garden this year!
Your seeds are GREAT! I'm looking forward to planting these again this year!!!
So happy to be adding these seeds to my garden this year!! Thanks so much for the offering!
Seller is pleasant and shipment was swiftly excited to plant and see the outcome ty
Thank you very much! they look great and arrived in good condition!
The seeds arrived around the estimated time of arrival. They were well packaged and looked good. I planted a few 3 days ago and I've already got sprouts.
I hope these flowers will grow in North Dakota! The colors are vibrant and hopefully the bees will like them. I will have to wait until after the Big Thaw in April before I can plant them - can't wait!
