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Cool 18 Leeks

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Cool 18 Leeks

layout: base.njk title: "Leeks" plantName: "Allium ampeloprasum var. porrum" category: "Cool Season Crops" description: "Growing guide for Leeks in West Virginia Zone 6b/7a" tags: planting-guide

Type: Biennial (grown as annual)
Family: Amaryllidaceae (Allioideae)
Sun: Full sun (6+ hours)
Water: High (1.5-2" per week, consistent moisture essential)
Soil pH: 6.0-7.5 (optimal 6.5-7.0)
Hardiness: Zones 3-11 (very cold hardy, can overwinter)

📅 Planting Calendar (WV Zone 6b/7a)

Method Timing Notes
Start indoors February 1 - March 15 10-12 weeks before last frost. Sow 1/4" deep at 65-75°F. Germination in 10-14 days (slow). Transplants essential—leeks need long season.
Direct sow March 15 - April 30 Soil temp 50-85°F. Sow 1/2" deep, thin to 6-8". Long season makes direct sowing less reliable. Only early varieties.
Transplant April 15 - June 1 Harden off 7-10 days. Space 6-8" apart. Plant deep or trench/blade for blanching. Tolerates heavy frost (to 15-20°F).
Days to maturity 120-180 days Early: 120-140 days. Main season: 140-160 days. Late: 160-180 days. From transplant. Very long season.
Succession plant Not practical Single planting, extended harvest. Plant once for fall/winter/spring harvest.

🌱 Expected Yield

  • Per plant: 0.5-1.5 lbs per leek (depends on size and variety).
  • Per 10' row: 20-40 lbs.
  • Per season: Single planting provides 25-50 lbs per 10' row (extended harvest).

🌿 Growing Conditions

  • Soil: Deep, well-drained, fertile loam very high in organic matter. Leeks are heavy feeders with deep roots. Loose soil essential for straight, long shanks. pH 6.5-7.0 optimal. Amend with 4-6" compost before planting. Trenching or deep planting for blanching. Raised beds excellent.
  • Fertilizer: Heavy nitrogen feeder. Apply composted manure or extra compost at planting (3-4 tbsp per 10' row). Side-dress with nitrogen (blood meal, fish emulsion) monthly. Consistent fertility promotes vigorous growth. Stop fertilizing 1 month before harvest.
  • Companions: Excellent with carrots, celery, beets, cabbage family. Onions family masks carrot scent, carrots mask leek scent (mutual protection). Avoid planting with peas, beans.
  • Avoid: Plant away from peas, beans, asparagus. Rotate 3-4 years away from other alliums (onions, garlic, shallots).
  • Pests: Onion thrips (major pest—silvery leaves, insecticidal soap, beneficial predators), onion maggots (row covers, rotate), slugs (diatomaceous earth).
  • Diseases: Downy mildew (improve airflow, avoid overhead watering), neck rot (harvest properly, cure), white rot (long rotation, remove infected). Generally hardy.

🏺 Heirloom Varieties (5-10+)

'American Flag' (Broad London)

  • Source: Seed Savers Exchange, Baker Creek Heirloom Seeds (rareseeds.com), Johnny's Selected Seeds (johnnyseeds.com)
  • Days: 150 days
  • Notes: Victorian heirloom. Large, thick shanks (2-3" diameter). Dark blue-green leaves. Cold hardy. Excellent flavor, sweet. Traditional for exhibition. Late maturing but impressive size.

'Lincoln'

  • Source: Johnny's Selected Seeds, Baker Creek
  • Days: 130 days
  • Notes: Hybrid, F1. Early maturing. Uniform, straight shanks. Good blanching. Sweet, mild. Cold tolerant. Holds well in field. Popular with market growers.

'King Richard'

  • Source: Johnny's Selected Seeds, Baker Creek, Burpee (burpee.com)
  • Days: 135 days
  • Notes: Hybrid, F1. Long, slender shanks. Uniform. Early maturing. Sweet, tender. Cold tolerant. Good blanching. Industry standard.

'Tadorna'

  • Source: Johnny's Selected Seeds, Baker Creek
  • Days: 140 days
  • Notes: Hybrid, F1. Long white shanks. Vigorous. Cold hardy. Sweet flavor. Holds well in winter. Good for late harvest.

'Blue de Solaise'

  • Source: Seed Savers Exchange, Baker Creek, Southern Exposure Seed Exchange (southernexposure.com)
  • Days: 160 days
  • Notes: French heirloom. Blue-green leaves. Exceptionally cold hardy (can overwinter in zone 6+). Sweet, rich flavor. Traditional for winter harvest. Beautiful color. Slower but superior quality.

'Lancelot'

  • Source: Johnny's Selected Seeds, High Mowing Organic Seeds (highmowingseeds.com)
  • Days: 125 days
  • Notes: Hybrid, F1. Early, uniform. Good blanching. Sweet, mild. Cold tolerant. Disease resistant. Reliable producer.

'Bandit'

  • Source: Johnny's Selected Seeds, Baker Creek
  • Days: 145 days
  • Notes: Hybrid, F1. Long white shanks. Vigorous. Cold hardy. Holds through winter. Sweet flavor. Good for extended harvest.

'Giant Carentan'

  • Source: Seed Savers Exchange, Baker Creek
  • Days: 155 days
  • Notes: French heirloom. Very large, thick shanks (3-4"). Blue-green leaves. Cold hardy. Sweet, rich flavor. Traditional for fall/winter harvest. Impressive size.

'Musselburgh'

  • Source: Seed Savers Exchange, Baker Creek, Johnny's Selected Seeds
  • Days: 160 days
  • Notes: Scottish heirloom from 1800s. Thick, short shanks. Extremely cold hardy (can overwinter). Traditional for Scottish winters. Sweet, robust flavor. Heritage variety.

'Summer Carentan'

  • Source: Baker Creek, Seed Savers Exchange
  • Days: 120 days
  • Notes: Early French heirloom. Large shanks. Faster than other Carentan types. Good for early harvest. Sweet, tender. Traditional variety.

📜 Cultural History & Domestication

Domesticated: Leeks were domesticated from wild Allium ampeloprasum native to Mediterranean region over 4000-5000 years ago. Leeks represent selection for thickened leaf bases (shank) rather than bulbs (onions) or cloves (garlic).

Archaeological Evidence: Leek remains found in Egyptian tombs from 3000 BCE. Depicted in ancient Egyptian art. Greeks and Romans cultivated leeks extensively.

Historical Record: Ancient Egyptians cultivated leeks—fed to pyramid builders for strength. Greeks valued leeks—Theophrastus (371-287 BCE) described cultivation. Romans grew leeks throughout empire—emperor Nero reputedly ate leek soup exclusively for voice improvement (hence nickname "Nero the Leek-eater"). Romans spread leeks throughout Europe. The word "leek" derives from Old English "leac" (Saxon for allium). Welsh adopted leek as national symbol—reportedly wore leeks in battle against Saxons (640 CE), Saint David advised this for identification. St. David's Day (March 1) Welsh wear leek or daffodil. Leeks remained European staple while less common in Americas. European colonists brought leeks but onions proved easier. Leeks remained specialty crop. French cuisine elevated leeks—vichyssoise (cold leek-potato soup), fondue de poireaux (leek tart), leeks in bouquets garnis. Julia Child introduced leeks to American home cooks (1960s). Leeks remained somewhat exotic in America until 1980s-1990s foodie movement. Now standard at farmers markets, grocery stores. Leeks' long growing season (120-180 days) made them challenging for American gardens but worthwhile for flavor.

Cultural Significance: Leeks national emblem of Wales—worn on St. David's Day, included in Welsh regiment uniforms. Leicester City football club nicknamed "The Leeks." Leeks symbol of Wales alongside daffodil. Leeks central to French cuisine—essential for vichyssoise (invented 1917 by French chef at Ritz-Carlton New York), potato-leek soup, quiches, tarts. French preparation emphasizes gentle cooking to bring out sweetness. Leeks milder, sweeter than onions—subtle allium flavor. The white shank is most prized (tender, sweet), green tops used for stock (tougher but flavorful). Cleaning leeks notoriously tedious—dirt trapped between layers. Traditional method: slice lengthwise, fan under running water, or soak in water bath. This labor requirement kept leeks from becoming everyday vegetable. Chef preparation (professional cleaning) made leeks more accessible. Leeks' cold hardiness makes them perfect for winter garden—flavor improves after frost. Can harvest through winter in zone 6b/7a with mulch. This extends fresh vegetable season. Leeks stored in ground or cool, humid place (root cellar) for months. Nutritional profile similar to onions—vitamins A, C, K, folate, fiber, quercetin. Milder flavor suits people sensitive to onion pungency. Leeks take 5-7 months from seed to harvest—requires planning, patience. Start seeds indoors early spring, transplant after frost, harvest fall through spring. This long season rewards with extended harvest (pull as needed). Leeks excellent companion for carrots—each masks other's pest scent. Classic French potager pairing. The elegant appearance (tall, straight, blue-green) makes leeks ornamental in garden. Leeks' versatility—raw (young, tender), cooked (soup, tart, roasted), grilled—adds culinary options. Modern interest in season extension, winter gardening revived leek popularity.

🌾 Seed Saving

  • Method: Leeks are biennial—require vernalization (cold period) to flower. For seed saving, select best plants, leave in ground over winter (mulch heavily in zone 6b/7a—leeks very cold hardy) or dig and store in cool, humid place (root cellar at 35-40°F), replant in spring. In spring, plants send up 4-6' flower stalks with large, round umbels (cluster) of pink-purple, star-shaped flowers. Flowers are insect-pollinated (bees, flies, moths). Seeds mature 6-8 weeks after flowering, turning from green to black. Leek seeds are small, angular, black (similar to onion seeds but larger). Cut umbels when most seeds black but before shattering. Hang in paper bags in dry, ventilated area 2-3 weeks. Thresh by rubbing umbels between hands. Winnow by pouring between bowls in breeze to separate seeds from chaff.
  • Isolation distance: 2 miles minimum (up to 5 miles for pure seed). Leeks cross-pollinate readily with other Allium ampeloprasum varieties (elephant garlic, great-headed garlic) and related alliums. For pure seed, grow only one A. ampeloprasum variety or cage isolated plants with netting and hand-pollinate.
  • Viability: 1-2 years when stored in cool, dry, dark conditions in airtight containers. Leek seeds lose viability quickly—use fresh seed. Short storage life.
  • Special notes: Save seed from minimum 5-10 plants to maintain genetic diversity. Select for shank length, diameter, color, flavor, cold hardiness, bolt resistance. Leeks very cold hardy—easily overwinter in zone 6b/7a with minimal mulch. Biennial requirement means seed saving requires two full seasons. Leek seeds short-lived—plan to use within 1-2 years or trade/share. For best viability, store in airtight containers with silica gel. Leeks produce abundant seed—enough for years from few plants. Save from healthiest, straightest, most uniform plants.

📖 Sources Consulted

  1. Jett, Lewis W. "2026 Garden Calendar." WVU Extension Service.
  2. Ashworth, Suzanne. Seed to Seed: Seed Saving and Growing Techniques for Vegetable Gardeners, 2nd ed. Seed Savers Exchange, 2002.
  3. "Growing Leeks in the Home Garden." Ohio State University Extension, HYG-1603-08.
  4. "Leek Production Guide." University of Massachusetts Extension.
  5. "Leek Varieties." Seed Savers Exchange Yearbook. seedsavers.org, 2025.
  6. Baker Creek Heirloom Seeds Catalog. rareseeds.com, 2025.
  7. Johnny's Selected Seeds Grower's Library. johnnyseeds.com, 2025.
  8. Kiple, Kenneth F. and Kriemhild Coneè Ornelas, eds. The Cambridge World History of Food. Cambridge University Press, 2000. (Historical references)
  9. "The History of Leeks." University of Illinois Extension. web.extension.illinois.edu.
  10. "St. David and the Leek." BBC Wales History.

🌾 Natural Soil Amendments (Loop Farmstead Standard)

Only on-farm, regenerative inputs:

  • Compost: 1-2 inches annually (on-farm production)
  • Cover crops: Rye + vetch (fall), buckwheat (summer), daikon (compaction)
  • Wood chips: Pathways only (aged 2+ years for beds)
  • Fall leaves: Mulch or compost browns
  • Blood/bone meal: From farm-slaughtered animals
  • Biochar: Charged with compost tea (permanent carbon)
  • Wood ash: Light application from wood stove
  • Eggshells: Crushed/powdered (slow calcium)

❌ Never used: Synthetic fertilizers, mined minerals, gypsum, peat moss

See: natural_soil_amendments_standard.md for complete guide

Added to WV Planting Guide 26155 — The Loop Farmstead