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Winter Hardy Vegetable

leek

Mild onion-flavored stalks stand winter cold for months. Leeks deliver sweet long shanks from deep pots year-round.

3 min read
leek - Allium porrum
Light
Full Sun, 6+ Hours
Water
Weekly 1 Inch, Moist
Temperature
55-75°F
Humidity
40-60%
Difficulty
Easy
Pet Safe
Safe

Video Tutorials

Watch these helpful videos to learn more about leek care.

Growing Leeks from Sowing to Harvest

About leek

Leeks offer sweet tender shanks milder than onions for soups stews. Hardy stand-ins extend harvests through frosts.

Eastern Mediterranean native grows wild coastal rocky spots. Cultivated millennia loves cool fertile moist ground.

Indoors large pots yield in 120-150 days. Hill soil for white bases harvest anytime.

leek close-up

Watering Schedule

Even moisture builds fat shanks 1 inch weekly.

Deep water soil not leaves.
1 inch per week minimum.
Mulch conserves dampness.
Check dry spells often.
Avoid wet foliage fungi.
Reduce late autumn.
Avoid Drought Stress
Dry soil yields thin tough leeks.

Common Problems & Solutions

Here's how to identify and fix the most common leek problems.

Rust

Rust

Cause: Wet leaves orange spots.

Solution: Space air flow remove.

Leek Moth

Leek Moth

Cause: Larvae bore tunnels.

Solution: Row covers handpick.

Thrips

Thrips

Cause: Silvery streaks sap.

Solution: Neem hose strong water.

White Rot

White Rot

Cause: Fungus soil decayed.

Solution: Rotate 4 years destroy.

Downy Mildew

Downy Mildew

Cause: Humid gray patches.

Solution: Morning water dry foliage.

Bolting

Bolting

Cause: Cold spring shock.

Solution: Resistant varieties fleece.

Popular Varieties

Explore different leek varieties and find your perfect match.

Porvite
High yield.

Porvite

"Autumn Giant"

Large uniform long shanks bolt resistant. Early autumn harvest reliable.

Difficulty: EasyPrice: $5-7
Krypton
Space saver.

Krypton

"F1 Winter"

Compact upright disease hardy. December mature small plots.

Difficulty: EasyPrice: $6-8
Stamford
Early crop.

Stamford

"Early F1"

Quick bulk blue-green long stems. High yield fast.

Difficulty: EasyPrice: $5-7
American Flag
Sweet flavor.

American Flag

"Organic"

White blanched mild sweet winter hardy. Classic favorite.

Difficulty: EasyPrice: $5-6
Blue Solaise
Hardy beauty.

Blue Solaise

"French Heirloom"

Blue-violet leaves fat shanks cold hardy. Ornamental tasty.

Difficulty: ModeratePrice: $4-6
Lincoln
Fast small.

Lincoln

"Baby Leek"

Short shank quick baby harvest. Pots bunching ideal.

Difficulty: EasyPrice: $4-5

Care Tips & Best Practices

Humidity

Moderate fine mulch soil.

Feeding

Nitrogen side-dress May June.

Cleaning

Hoe weeds regular.

Support

Hill soil stability.

Pruning

Remove flower scapes.

Rotation

Turn pots even sun.

Care Checklist

0 / 10 completed

10 Common Mistakes to Avoid

1

Dry irregular water

Why it's bad: Thin tough shanks.

Do this instead: Weekly 1 inch even.

2

No rotation alliums

Why it's bad: White rot soil.

Do this instead: 4 years break.

3

Crowded thin spacing

Why it's bad: Small weak plants.

Do this instead: 15cm apart.

4

Overhead leaf water

Why it's bad: Rust mildew spread.

Do this instead: Soil base soak.

5

Cold spring sow

Why it's bad: Bolting poor germ.

Do this instead: Indoor 60°F start.

6

Poor soil nutrient

Why it's bad: Stunted low yield.

Do this instead: Compost nitrogen.

7

No hill blanch

Why it's bad: Short green shank.

Do this instead: Monthly soil up.

8

Weedy competition

Why it's bad: Stunted weeds win.

Do this instead: Hoe mulch weekly.

9

Hot shade summer

Why it's bad: Weak bolt prone.

Do this instead: Full sun cool.

10

Harvest too early

Why it's bad: Pencil thin small.

Do this instead: Thumb thick wait.

Frequently Asked Questions

Grow leeks indoors pots?

Deep 10-gallon sun moist. Harvest 120 days baby sooner.

Why thin tough shanks?

Dry soil drought. Even weekly water mulch fixes.

Water leeks often?

1 inch weekly shallow roots. Mulch conserves dry spells.

Harvest size time?

Pencil baby 90 days thumb mature 150. Hill white.

Prevent leek rust?

Space air flow dry leaves. Resistant varieties rotate.

Best fertilizer leeks?

Nitrogen side-dress May June. Compost rich base.

Blanch leeks how?

Hill soil exclude light. Holes puddle deep plant.

Cold hardy winter?

Stand frosts sweetens. Harvest anytime in ground.

Pets eat leek safe?

Non-toxic raw moderation. Onions kin caution large.

Propagate leek seeds?

Indoor 8 weeks transplant. Offsets divide clumps.

References & Sources

Information in this guide is based on these trusted sources.

1
How to grow Leeks | RHS Guide
Royal Horticultural Society
2
Growing leeks in home gardens
University of Minnesota Extension
3
Allium ampeloprasum (Porrum Group)
Missouri Botanical Garden
4
Allium ampeloprasum
NC State University Plant Toolbox

Plant Details

Botanical Name
Allium ampeloprasum var. porrum
Common Names
Leek, Porrum
Family
Amaryllidaceae
Native Region
Eastern Mediterranean
Growth Habit
Biennial bulb
Max Height Indoors
24-36 inches
Growth Rate
Slow
Toxicity
Non-toxic
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