Giant Musselburgh

Family: Amaryllidaceae Vegetable

Planting Schedule

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Sweet, mild, and richly aromatic—Giant Musselburgh leeks unfurl into long, tender stalks with a creamy, pale core that feels silky between the fingers.

Expect a substantial, upright growth habit and a satisfying bite that turns beautifully mellow when roasted or simmered, making them a standout for hearty dishes and elegant sauces. A classic market-class choice for gardeners who love dependable performance and impressive size at 120 days.

Light: Full SunMaturity: 120 DaysHabit: Upright

Botanical illustration of Giant Musselburgh

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Giant Musselburgh Planting Dates by USDA Zone

Estimated US hardiness-zone windows for sow, transplant, and harvest. Enter a US ZIP above for exact local dates, or open a zone below.

Zone	Start Indoors	Sow / Transplant	Harvest
Zone 1a	Protected Environment Only
Zone 1b	Protected Environment Only
Zone 2a	Protected Environment Only
Zone 2b	Protected Environment Only
Zone 3a	Protected Environment Only
Zone 3b	Mar 10th	May 19th	Sep 16th – Sep 21st
Zone 4a	Mar 6th	May 15th	Sep 12th – Sep 24th
Zone 4b	Mar 4th	May 13th	Sep 10th – Sep 27th
Zone 5a	Feb 27th	May 8th	Sep 5th – Sep 30th
Zone 5b	Feb 23rd	May 4th	Sep 1st – Oct 5th
Zone 6a	Feb 20th	May 1st	Aug 29th – Oct 10th
Zone 6b	Feb 14th	Apr 25th	Aug 23rd – Oct 16th
Zone 7a	Feb 9th	Apr 20th	Aug 18th – Oct 20th
Zone 7b	Jan 30th	Apr 10th	Aug 8th – Oct 28th
Zone 8a	Jan 21st	Apr 1st	Jul 30th – Nov 5th
Zone 8b	Jan 12th	Mar 23rd	Jul 21st – Nov 12th
Zone 9a	Dec 26th	Mar 6th	Jul 4th – Nov 26th
Zone 9b	Dec 1st	Feb 9th	Jun 9th – Dec 9th
Zone 10a	—	Oct 1st	Jan 29th – Feb 28th
Zone 10b	—	Oct 1st	Jan 29th – Feb 28th
Zone 11a	—	Oct 1st	Jan 29th – Feb 28th
Zone 11b	—	Oct 1st	Jan 29th – Feb 28th
Zone 12a	—	Oct 1st	Jan 29th – Feb 28th
Zone 12b	—	Oct 1st	Jan 29th – Feb 28th
Zone 13a	—	Oct 1st	Jan 29th – Feb 28th
Zone 13b	—	Oct 1st	Jan 29th – Feb 28th

Crop Details

Trait	Value
Days to Maturity	120
Sun Requirements	Full Sun
Growth Habit	Upright
Support Needed	None
Planting Depth	Normal
Germination Temp (°F)	70
Min Soil Temp (°F)	45
Min Night Temp (°F)	35
Harden Off (days)	7

Culinary Notes

Chef's Note

Giant Musselburgh leeks lean sweet and mellow rather than sharp, with a silken core that stays luxurious even as the outer layers soften. Roast or simmer them and they collapse into that creamy, savory-sweet texture that binds beautifully with butter, dairy, and wine.

Best Uses

slow-roasted leek halves until jammy at the edges
simmered soup base for creamy purees and smooth consommé-style broths
sautéed leeks as the backbone for rich tarts and gratins
braised leek rounds in butter until silk-soft for side dishes

Flavor Profile

sweet, mild allium flavor creamy, silky pale core tender bite that turns mellow when cooked

Kitchen Pairings

butter heavy cream parmesan white wine thyme potatoes

Frequently Asked Questions

What pest or disease is most common on Allium porrum (giant leek) and how do I control it?

Leek moth (Crocidomorphus/Plutella-related pests) is a common problem: larvae bore through the stalks and leave frass trails. Start with tight weed-free beds and use fine insect netting as soon as plants are established; remove and destroy heavily damaged leaves. If you see ongoing damage, apply an approved Bt (Bacillus thuringiensis) product labeled for lepidopteran caterpillars and re-apply according to label intervals.

How often should I water Allium porrum during the main growing phase?

During the 60–110 day growing window (after seedlings establish), keep the soil consistently evenly moist but never waterlogged—aim for about 1 inch (2.5 cm) of water per week split into 1–2 deep sessions. Water more frequently during hot spells so the inner leaf bases don’t dry out; leeks are sensitive to irregular moisture that can lead to thin, woody stems. Check by feel: the top few inches should be moist and crumbly, not dry or soggy.

How can I tell when Giant Musselburgh leeks are ready to harvest?

Harvest when stems reach the cultivar’s expected size and the plants are firm, with a full, white-to-light-green “blanched” portion from earthing up. For Giant Musselburgh, start checking at about 120 days after sowing/transplanting; you can lift earlier for smaller sizes but wait for thicker stems for best quality. Stop harvest before heavy freezes; cut the roots cleanly and leave some leaf length for easier handling.