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Growing Leeks in Queensland

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. In Queensland, they grow best during the cool winter months.

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 Sun - Full Sun

Leeks prefer full sun, but will tolerate some shade.

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: February-May
Sowing depth: 10mm

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: April-May

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.

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.

Weed well around your leeks. They don’t like to compete for nutrients and space.

Watering

Keep the soil moist, but not too wet. The Queensland autumn weather might not be wet enough to establish your plants, so keep an eye on the soil and make sure it doesn’t dry out.

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 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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