VegetableLeek
Carentan Leek
Heritage Variety
The Carentan leek stands as a testament to European gardening heritage, arriving in America during the 1880s with thick, impressive 2-inch diameter stalks that tower above standard varieties. This vigorous heirloom produces tender white stems reaching 8.5 inches long in 100-119 days, delivering yields approximately 30% higher than typical leeks. Hardy enough to withstand frost and resilient in cold weather, Carentan thrives with 10-inch spacing and rewards patient gardeners with substantial harvests that can remain in the garden until the ground freezes.
Photo © True Leaf Market(https://www.trueleafmarket.com/products/leek-seeds-carentan)
Growing Conditions
Sunlight
Full Sun
Soil
Well-drained, Fertile Loam, High In Organic Matter
Preferred Temp50-75°F
Growth Stats
PeriodBiennial
TypeUpright
Spacing
6-8 inches apart
Plant Profile
Sunlight
Full Sun
Water
—
Zones
?-?
Size
?in H x ?in W
Growth
Biennial
Care
Moderate
Hover over chart points for details
Highlights
What sets Carentan apart is its remarkable combination of size, vigor, and cold hardiness that made it a cherished staple across northern Europe's allotment gardens. These fast-growing leeks develop impressively thick stalks while maintaining a delicately mild, sweet onion flavor that shines whether used fresh or cooked. Originally documented by the renowned French seed house Vilmorin in 1885, this increasingly rare variety delivers exceptional yields in challenging conditions where other leeks might struggle.
Common Uses
Carentan leeks excel in rich, warming dishes that showcase their delicate, mild onion flavor and tender texture when cooked. These substantial leeks are perfect for classic potato leek soup, where their gentle sweetness creates a velvety, comforting base. Their robust size makes them ideal for vegetable quiches paired with asparagus, while their subtle flavor profile allows them to substitute for onions in virtually any recipe. The impressive white stems, achieved through careful hilling, provide both visual appeal and concentrated flavor for braising, roasting, or incorporating into hearty winter stews.
Growing Timeline
First Bloom
N/a
First Harvest
Early Autumn
Last Harvest
Late Winter
Care Instructions
Start Indoors
Sow Carentan leek seeds indoors 8-10 weeks before the last frost date, planting them 1/4 to 1/2 inch deep in seed starting mix. Seeds typically germinate in 7-14 days under ideal conditions of 45-80°F.
Transplant Outdoors
Transplant hardened-off seedlings outdoors 6-8 weeks before the last spring frost, when seedlings reach about 3 inches tall. Set plants 4-10 inches apart in rich, well-prepared garden soil, planting 4 leeks per square foot if using intensive spacing methods.
Harvesting
Harvest Carentan leeks when the white stems reach their full 8.5-inch length and 2-inch diameter, typically after 100-119 days from seeding. These frost-hardy leeks can remain in the garden until just before the ground freezes, actually improving in flavor with light frost exposure. Pull the entire plant when needed, and thoroughly wash between the leaf layers to remove any soil that may have accumulated during the hilling process.
Growing Calendar
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Companion Planting
Ecology & Traits
Edible
Soil pH Range
6 – 8
Scientific Classification
Allium ampeloprasum L.
Family
Liliaceae
Genus
Allium
Duration
Perennial
Growth Habit
Forb/herb
Native Status
L48 (I)
History & Origin
“The Carentan leek traces its roots to the cherished allotment gardens of northern Europe, where generations of gardeners cultivated this hardy variety for its exceptional cold tolerance and impressive yields. First documented by the prestigious French seed company Vilmorin in 1885, Carentan made its way across the Atlantic to American gardens in the 1800s, becoming commercially available by the 1880s. This old European favorite sustained families through harsh winters, prized not only for its substantial size but also for its ability to remain harvestable even as frost threatened other crops.”