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Growing Leeks in The ACT

Introducing Leeks

This lovely cool-weather crop is a member of the onion family. Its sweet, mild flavour makes it a useful and versatile addition to any vegetable garden. Leeks are easy and fuss-free to grow and can be left in the ground for up to 12 months in cool weather. In The ACT, they can be planted in autumn or spring. Autumn-planted leeks will grow through winter and be ready to harvest in early spring, while the spring-planted ones will be ready for harvest in late summer and autumn.

Classic Mistakes

Don’t allow your soil to dry out or become too wet. Leeks like a nice, even amount of moisture throughout their growing season.

Sunlight

Grow in: Partial Shade - Full Sun

Leeks prefer full sun, but will tolerate some shade. If you’re planting in autumn, then make sure they get all the sun they can. If you’re planting in spring, then a little shade will help protect them from the harsh summer sun.

Soil Preparation

Add some compost, well-rotted manure and lime to your soil. Leeks like rich, well-draining soil with plenty of nitrogen.

Sowing Seed

Sow seed: September-October and December-January
Sowing depth: 10 mm

If you’re wanting to plant in Autumn, then you need to start your seeds in December or January to be ready to transplant in March. Seeds for cool-season plants need to be started earlier in The ACT than in most other regions of Australia, so that they can be well established before the cold of winter sets in. Spring-planted leeks will be smaller than autumn-planted leeks. Sow seeds every 4 weeks to prolong the harvest.

Leeks are usually sown in pots and then transplanted into the garden once they are big enough. Sprinkle the seeds over the soil, cover them lightly, and water well. Put them in a warm, light spot and be sure to keep the soil moist while the seeds germinate.

Planting

Plant seedlings: All of March and September-November

Plant your seedlings into 150 mm deep holes. Backfill the holes with soil or compost as the leeks grow. This will help to blanch the lower part of the stem. Seedlings are often clumped when you buy them and need to be separated before planting. Simply remove them from their container and rinse the soil off. Once the soil is off, they should separate easily. Trim the tops of the leaves to help your plants transplant more easily.

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Care

If you would like a larger section of the stem to be blanched, then cover the stems for a couple of weeks before you harvest them. Simply place a barrier around the stem and secure it. Keeping the stems away from sunlight makes them whiter. Newspaper, or toilet rolls work well, but feel free to use whatever you have on hand.

Watering

Keep the soil moist, but not too wet.

Feeding

Feed your leeks every 4-6 weeks. They like a fair amount of nitrogen, so a nitrogen-rich organic fertilizer or even some manure tea are good options.

Mulching

Mulching leeks helps to keep the soil moist and coil. Apply a generous layer of organic mulch such as lucerne or sugarcane. For young seedlings, a mulch of around 1 cm should be enough, but you can increase the mulch to around 4 cm as they grow. Remember to top up your mulch throughout the growing season, as it does tend to break down.

Harvesting

Harvest: 15 to 18 Weeks After Planting

Use a gardening-fork to gently lift the leeks out of the soil or use a sharp knife to cut the stems off below the soil. Leeks keep well in the soil, so harvest them as needed.

What to Plant Now

What to do about Snails and slugs?

Lay down grit, like eggshells or silica sand or create barriers around your plants. Remove any slugs or snails that you see.
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