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Allium ampeloprasum var. porrum
Growing calendar
Typical timing for central Japan (Kanto region). Shift it for your own climate, and record your actual dates.
Guides
- How to Sow Leeks and Raise Strong Seedlings Under Cover
- Planting Out Leeks: Trim, Drop Into Deep Holes or a Trench, Water In
- Earthing Up Leeks: Blanching the Shank, Feeding and Watering
- When to Harvest Leeks: From Late Summer Through Winter
- Leek Problems: Rust, Allium Leaf Miner, Leek Moth, Thrips, White Rot and Downy Mildew
- Leek Growing Calendar: Early and Late Cultivars Season by Season
Common problems
Start from what you can see on the plant.
Pests and diseases (6)
Problems recorded for this plant, most serious first.
Rust
MajorDisease
Small raised orange-yellow to red-brown pustules form on both leaf surfaces, then rupture and release powdery spores. Heavy infection yellows the leaves and kills them early.
Onion Thrips
CommonPest
Fine white stippled scars run in vertical lines along the leaf surface, and the whole leaf eventually turns whitish. Growth stops and both yield and quality suffer.
Downy Mildew
CommonDisease
Pale yellow to yellow-brown angular lesions form on the upper leaf surface with a gray-purple mold in the matching spot underneath. Lesions merge, the leaves die back and the plant declines early.
Alternaria Black Spot
CommonDisease
Leek Moth
OccasionalPest
White grazed scars and small holes line the leaf surface, and splitting the leaf reveals larvae inside. Damaged leaves snap easily and die back.
Leafminer Flies
OccasionalPest
Winding white tunnels run through the leaf with the larva at the head of the mine. Heavy mining turns the whole leaf white and dead, cutting photosynthesis.
