Leek | Large Musselburg

Grow thick, tender, and deeply flavorful white shafts of Large Musselburg leeks in your home garden. Originating in Scotland in the early 1800s, this historic heirloom variety is world-renowned for its legendary cold hardiness, broad fan-like blue-green leaves, and exceptionally sweet, mild onion-like flavor that enriches autumn soups, stews, quiches, and roasts.

These robust plants produce thick, heavy stems reaching 2–3 inches in diameter with a tender, non-stringy texture that holds up beautifully in the kitchen. Perfectly suited to Canada's cool climate, Large Musselburg leeks thrive through frosty autumn temperatures and can even be harvested fresh from under winter snow in milder regions.

Why Grow Large Musselburg Leeks?

• Historic Scottish heirloom prized for producing extra-thick, heavy white shafts
• Exceptional cold hardiness—stands through freezing winter weather without losing quality
• Broad, attractive fan-like blue-green foliage on vigorous, stocky plants
• Rich, mild, and sweet flavor that intensifies after light autumn frosts
• Approximately 100–120 days to maturity from transplanting
• Grows best in full sun
• Open-pollinated heirloom variety
• Approximately 80-90 seeds per packet

How to Grow Large Musselburg Leeks from Seed

Start leek seeds indoors 8–10 weeks before your last spring frost date. Sow seeds approximately 6 mm (1/4 inch) deep in flat trays filled with a sterile, well-draining seed-starting mix.

Keep soil consistently moist and maintain warm temperatures around 18–21°C (65–70°F) until germination occurs. Trim indoor tops to 3–4 inches to build strong, thick bases before planting outdoors.

Harden off seedlings carefully and transplant outdoors in late spring once soil can be worked. Plant in individual dibbled holes 10–15 cm (4–6 inches) deep, spaced 10–15 cm (4–6 inches) apart in rows spaced 30–45 cm (12–18 inches) apart. Do not fill the holes with soil; water gently to let soil settle naturally around roots.

As leeks grow, hill loose soil around the stems progressively to blanch the shafts, keeping them long, tender, and pure white.

Growing Leeks in Canada

Large Musselburg leeks are custom-made for Canadian climates, having been bred to withstand the harsh, damp cold of Scottish winters. They excel in cool spring soil and perform exceptionally well through late autumn frost, becoming sweeter as temperatures drop.

Maintain consistent soil moisture and apply a thick layer of organic compost or straw mulch to protect root zones and keep soil cool through warm summer spells.

For detailed instructions covering seed starting, spacing, watering, fertilizing, harvesting, and pest management, read our How To Grow Leeks in Canada | Complete Guide.

Large Musselburg Leek Growing Information

Feature	Detail
Botanical Name	Allium ampeloprasum '
Common Name	Leek (Large Musselburg / Giant Musselburg)
Plant Type	Biennial grown as an annual allium crop
Sun Requirements	Full sun
Days to Maturity	Approximately 100–120 days
Seed Count	Approximately 80-90 seeds
Pollination Type	Open-pollinated heirloom variety
Best Uses	Potato leek soup, winter stews, quiches, braising, and late autumn/winter harvests

Grow Your Own Large Musselburg Leeks

There is nothing quite like pulling heavy, tender leeks fresh from frozen late-autumn garden soil. With their rich flavor, thick stems, and cold tolerance, Large Musselburg leeks are an essential and deeply satisfying addition to your Canadian vegetable garden.

Start your seeds indoors this season and enjoy a gourmet winter harvest of sweet, fresh leeks!