How to Sow and Grow Leeks

Leeks are a versatile and flavourful addition to any garden, prized for their mild onion-like taste. Whether you’re a seasoned gardener or just starting, growing leeks can be a rewarding experience. In this guide, we’ll cover everything from sowing to harvesting, ensuring you have a bountiful crop.

When to Sow

Leeks thrive in cooler weather. Depending on your climate, you can start sowing seeds indoors 10-12 weeks before the last frost or directly in the garden 4-6 weeks before your expected last frost date.

Sowing Seeds Indoors

• Prepare Your Containers: Use seed trays or small pots filled with seed compost. Ensure they have drainage holes.
• Sow the Seeds: Plant the seeds about 2 cm deep, spacing them 4-6 cm apart.
• Water and Cover: Gently water the seeds and cover them with a clear plastic lid or plastic wrap to maintain humidity. Remove the cover once seedlings emerge.
• Light and Temperature: Place the trays in a sunny location or under grow lights. Ideal temperatures for germination are between 18℃ and 28℃.

Transplanting Seedlings

Once your seedlings are about 24 cm tall and have developed several leaves, it’s time to transplant them into the garden:

• Prepare the Soil: Choose a sunny spot with well-draining soil rich in organic matter. Add compost or well-rotted manure to enhance fertility.
• Harden Off: About a week before transplanting, gradually expose your seedlings to outdoor conditions to help them acclimate.
• Planting: Dig trenches about 24 cm deep and 40 cm apart. Space seedlings about 24-30 cm apart within the trench. Drop the seedlings in, covering their roots but leaving the tops exposed.

Caring for Your Leeks

• Watering: Keep the soil consistently moist, especially during dry spells. Drip irrigation works well for leeks as it keeps the leaves dry and minimises disease.
• Weeding: Regularly check for weeds, as they compete for nutrients and water. Hand-pulling is recommended to avoid disturbing the leeks’ shallow roots.
• Hilling: As leeks grow, they will benefit from hilling. Pile soil around the stems to promote a longer, more tender white part and protect them from sunlight.

Pest and Disease Management

Leeks can be susceptible to pests like leek moths and onion flies. Use row covers to protect young plants and consider companion planting with herbs like marigold to deter pests. For diseases, ensure good air circulation and avoid overcrowding.

Harvesting

Leeks can be harvested at any size, but they are typically ready 100-120 days after sowing. To harvest, use a fork or spade to loosen the soil around the base and gently pull them out. Trim the roots and leaves to about 4 cm above the bulb for storage.

Storage Tips

• Leeks can be stored in the refrigerator for up to two weeks. For longer storage, you can freeze them. Simply chop and blanch before placing them in freezer bags.

Leeks are a rewarding crop to grow and make a delicious addition to soups, stews and many other hearty, winter dishes. Happy growing!

Video – How to Sow and Grow Leeks