How To Grow Leeks in Australia

Quick Guide: Growing Leeks

  • Optimal Growing Temperatures: Between 8°C and 30°C.
  • Ready to Harvest: 15-18 weeks after planting.
  • Space Between Plants: Plant 10-20 cm apart.
  • Companion Plants: Carrots
  • Non-Companion Plants: None
  • Plant Type: Seed.

When to Plant Leeks in Australia

Australia Map


Best planting months for Leeks in the Tropical regions are April, May and June. This includes areas like Cairns, Darwin, and Broome.

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For the Subtropical region, Leeks can be planted from January to April and August to September. Cities in the Subtropical region include Brisbane, Central Coast, and Sydney.

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Leeks can be planted from January to March and July to December in the Temperate regions of Australia. Cities in the Temperate region include Melbourne, Adelaide, Geelong, and Perth.

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For the Cool region, Leeks can be planted from January to Febraury and August to December. Cities in the Cool region include alpine regions of Victoria and Tasmania.

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Best planting months for Leeks in the Arid region is February, April, May, July, and September.

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Planting and Caring for Leeks

Growing leeks in Australia can be a rewarding experience, and with proper care and attention, you can enjoy a bountiful harvest. In this section, I will guide you through the process of starting leeks from seeds, transplanting seedlings, watering and mulching tips, as well as fertilizing and feeding your leeks.

Starting Leeks from Seeds

To begin your leek-growing journey, start by sowing leek seeds indoors in seed trays or pots about 8-10 weeks before the last frost date in your area. Fill the containers with a well-draining seed-starting mix and sow the seeds thinly, about 1/4 inch deep. Keep the soil consistently moist and provide warmth by placing the trays in a warm location or using a seedling heat mat. Germination usually takes around 10-14 days.

Once the leek seedlings have grown to a height of about 6-8 inches and have developed a few leaves, they are ready for transplanting.

Transplanting Leek Seedlings

Before transplanting the leek seedlings into the garden bed, it's important to prepare the soil by incorporating organic matter and ensuring it is well-drained. Leeks thrive in soil with a pH level between 6.0 and 7.0. If necessary, adjust the pH using organic soil amendments.

Dig holes for the leek seedlings, making them around 6 inches deep and 6 inches apart. Gently remove the seedlings from their containers, being careful not to damage the roots. Place each seedling into a hole, ensuring the white stem is fully buried while the green leaves remain above the soil surface. Backfill the holes with soil, firming it gently around the seedlings.

Watering and Mulching Tips

Leeks require consistent moisture to grow well, especially during the warmer months. Adequate watering is essential, but be careful not to overwater as this can lead to rotting. Provide about 1 inch of water per week, ensuring the soil is evenly moist but not waterlogged. Mulching around the leek plants with organic materials like straw or wood chips can help retain soil moisture and suppress weed growth.

Fertilising and Feeding Leeks

Leeks are heavy feeders and benefit from regular fertilisation. Before planting, incorporate well-rotted compost or organic matter into the soil. This will provide a slow-release source of nutrients. As the leeks grow, you can apply a balanced organic fertiliser or a specially formulated vegetable fertiliser according to the package instructions. Avoid excessive nitrogen fertilisers as they can cause the leeks to produce more foliage than bulbs.

A foliar feed of liquid seaweed fertilizer once every few weeks during the growing season can also provide a nutrient boost to your leeks. Ensure you follow the manufacturer's instructions for application rates.

By following these planting and care tips, you can set your leeks on the path to success. Remember to monitor for pests and diseases, as well as provide adequate support for taller varieties if needed. For more information on growing vegetables and herbs in Australia, check out our other articles such as how to grow shallots in Australia and how to grow chives in Australia. Happy leek growing!

Managing Pests and Diseases

To ensure the successful growth of leeks in Australia, it's important to be aware of common pests and diseases that can affect these plants. By understanding the potential challenges and implementing effective management strategies, you can safeguard your leeks and promote their healthy growth.

Common Pests for Leeks

Leeks can be susceptible to various pests that can hinder their growth and cause damage. Some of the common pests that you may encounter when growing leeks include:

Pest Name



Small insects that feed on the sap of plants, causing distortion and stunted growth.

Leek Moths

Caterpillars that feed on leek leaves, resulting in ragged edges and reduced plant vigor.

Onion Thrips

Tiny insects that suck the sap from leek leaves, leading to silvering and distortion.

Slugs and Snails

Soft-bodied pests that feed on leaves and stems, leaving behind slime trails and holes.


Larvae of click beetles that feed on leek roots, causing stunted growth and yellowing.

Natural Pest Control Methods

When it comes to managing pests in an organic garden, it's important to prioritize natural and environmentally friendly methods. Here are some effective strategies for controlling common pests in leeks:

  • Handpicking: Regularly inspect your leek plants and manually remove any visible pests like aphids, leek moths, or slugs. This can help prevent their populations from growing and causing significant damage.
  • Companion Planting: Planting leeks alongside repellent plants like chives, shallots, or jalapenos can help deter pests. These companion plants emit scents or substances that repel common pests, reducing the risk of infestation.
  • Natural Predators: Encourage beneficial insects like ladybugs, lacewings, and predatory wasps to your garden. These insects prey on pests, helping to naturally control their populations.
  • Physical Barriers: Use physical barriers like copper tape or diatomaceous earth around your leek plants to deter slugs and snails. These barriers create a barrier that pests find difficult to cross.

Preventing and Treating Diseases

Leeks can also be susceptible to various diseases that can affect their overall health and productivity. To prevent and manage diseases, it's essential to implement good cultural practices. Here are some tips:

  • Crop Rotation: Avoid planting leeks in the same location year after year. Rotate your crops to different sections of your garden to minimise the risk of diseases building up in the soil.
  • Good Drainage: Ensure that your leek beds have proper drainage to prevent waterlogging, which can lead to fungal diseases. Avoid overwatering and provide adequate spacing between plants to encourage airflow.
  • Sanitation: Practice good garden hygiene by removing any diseased plant material promptly. Dispose of infected leaves or plants away from your garden to prevent the spread of disease.
  • Fungal Control: If fungal diseases such as leaf blight or rust appear on your leek plants, consider using organic fungicides or homemade remedies like a baking soda spray to suppress the disease. Always follow the instructions on the product label.

By being proactive in managing pests and diseases, you can ensure the health and vitality of your leeks. Regular monitoring, natural pest control methods, and good cultural practices will help you maintain thriving leek plants throughout the growing season.

Harvesting and Storing Leeks

As an avid gardener, there's nothing more satisfying than harvesting your own homegrown leeks. Knowing when and how to harvest leeks is essential to ensure the best flavour and quality. In this section, I'll share some tips on when to harvest leeks, the proper techniques for harvesting, and how to store them for long-lasting freshness.

Signs of Ready-to-Harvest Leeks

Determining when leeks are ready for harvest is relatively straightforward. Keep an eye out for the following signs:

  • Bulb Size: Mature leeks typically have a bulbous white stem, which should be around 1.5 to 2 inches (4 to 5 centimetres) in diameter. This indicates that the leeks have reached a sufficient size for harvesting.
  • Length: The ideal length of a leek for harvest can vary depending on personal preference and the desired use. Generally, leeks can be harvested when they are 6 to 10 inches (15 to 25 centimeters) long.
  • Firmness: Gently squeeze the lower part of the leek stem. If it feels firm and solid, it is likely ready for harvest.

Remember, leeks left in the ground for too long may become tough and lose their tender texture. It's better to harvest them slightly earlier rather than risk them becoming overgrown.

Harvesting Techniques

To harvest your leeks, follow these simple steps:

  1. Loosen the Soil: Use a garden fork or shovel to gently loosen the soil around the base of the leeks. Be careful not to damage the stems or roots during this process.
  2. Lift the Leeks: Grasp the leek stem close to the ground and gently lift it out of the soil. If the soil is compacted, you may need to wiggle the leek slightly to release it from the ground.
  3. Trim the Roots: Use a sharp pair of garden shears or a knife to trim the roots close to the base of the leek. Remove any damaged or discoloured leaves as well.
  4. Optional: Remove Outer Leaves: If the outer leaves of the leek appear wilted or damaged, you can peel them away to reveal the fresh, crisp inner layers.

Proper Storage of Leeks

To maximize the shelf life of your harvested leeks, it's important to store them properly. Follow these guidelines:

  1. Trim and Clean: Trim the dark green tops of the leeks, leaving about an inch (2.5 centimetres) of green remaining. Remove any outer leaves that may be damaged or wilted. Rinse the leeks under cool water to remove any dirt or debris.
  2. Store in the Fridge: Leeks can be stored in the refrigerator for up to two weeks. Wrap them loosely in a damp paper towel and place them in a plastic bag or airtight container. The moisture will help keep the leeks hydrated and maintain their crispness.
  3. Freezing Leeks: If you have an abundance of leeks, you can also freeze them for long-term storage. Clean and chop the leeks into desired sizes, blanch them in boiling water for two minutes, then transfer them to an ice bath to cool. Pat them dry and pack them into freezer-safe bags or containers. Frozen leeks can be stored for up to six months.

By following these harvesting and storage tips, you can enjoy your homegrown leeks in various delicious recipes. You can also enjoy growing other plants and herbs in our A-Z Growing Guides.

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