Allium porrum
Allium porrum
Leek
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Taxonomy
Family Amaryllidaceae · Genus Allium
Common Names
LeekGarden leek
Context
nativeRegion
Likely native to the Eastern Mediterranean and Southwest Asia, cultivated globally.
usdaZones
Generally grown as an annual in zones 2–10.
companionPlants
Carrots, Celery, Beets, Tomatoes
culturalUses
Edible; used in soups, stews, and as a flavoring vegetable in various cuisines.
Care
Care Requirements
LightFull sun is best, though it can tolerate partial shade.
WateringKeep soil evenly moist but not waterlogged, especially during dry spells.
SoilWell-drained, fertile soil high in organic matter with a neutral to slightly alkaline pH.
FertilizerApply compost or a balanced fertilizer at planting; side-dress with nitrogen during growth.
HumidityTolerant of average outdoor humidity; does not require special conditions.
TemperaturePrefers cool to moderate temperatures (13–24°C); can tolerate light frosts.
Growth & Life Cycle
HabitUpright biennial grown as an annual for edible stems (leeks).
Mature Size30–60 cm tall, 2–5 cm thick stems.
Growth RateModerate rate; 80–120 days from seed to harvest.
BloomingRarely blooms in cultivation; flowers in the second year if not harvested.
DormancyGoes dormant after seed set or prolonged heat.
Propagation
MethodsSeed, Transplanting young seedlings
DifficultyEasy to moderate from seed.
Best SeasonStart indoors late winter or direct sow early spring.
Maintenance & Notes
PruningNo pruning needed; just remove damaged leaves.
RepottingNot typically grown in containers; thin seedlings as needed.
Pests & DiseasesSusceptible to onion fly, leek moth, thrips, rust, and downy mildew.
ToxicityNon-toxic to humans and pets.
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