
Celeriac is a vegetable that is related to celery, but it is the bulbous root that is eaten, not the stems. It is known for its nutty, mildly spicy flavour and creamy texture. It is easy to grow in a temperate climate and can be used in a wide range of dishes. In this article, we will discuss how to grow celeriac successfully in Australia, including the best time to plant, the ideal growing conditions, and how to care for your celeriac plants. With the right techniques, you'll be able to enjoy this delicious and versatile vegetable in your meals all year round.
| Characteristics | Values |
|---|---|
| Climate | Temperate |
| Soil type | Loose, well-drained, rich, loamy |
| Soil pH | Slightly acidic to neutral (6.0-7.0) |
| Sowing depth | 8mm |
| Seed spacing | 45cm |
| Germination time | 2-3 weeks or longer in cooler conditions |
| Transplant spacing | 20cm with rows at least 40cm apart |
| Watering | Regular, every second day |
| Mulch | Sugar cane mulch |
| Fertiliser | Low nitrogen |
| Harvest time | 14-28 weeks |
| Companion plants | Beans, brassicas, carrots, leeks, lettuce, peas, sage, tomatoes, onions |
| Avoid planting near | Corn plants, aster genus flowers |
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What You'll Learn

Planting times and seasons
The best time to plant celeriac in Australia varies depending on the region and climate. Here is a breakdown of the recommended planting times for different areas:
Cooler Regions
In the cooler regions of Australia, the ideal planting time for celeriac is from October to December. This gives the plants a chance to establish themselves before the coldest months.
Temperate Regions
In temperate areas, celeriac can be sown from September to December. Starting the seeds indoors or in a cold frame in late winter is advisable, and then they can be transplanted outdoors as the weather warms up.
Subtropical Regions
For subtropical parts of Australia, the recommended planting times are during the months of March, April, September, or October.
Tropical Regions
In the tropical regions, celeriac should be sown during the dry season, which is typically from April to July.
Spring and Early Summer
Across Australia, celeriac is often associated with spring planting, and seeds or seedlings are usually available from local nurseries during this time. It is a slow-growing plant, so starting in spring gives it ample time to develop before the following winter.
Avoiding Frost
It is important to note that celeriac is sensitive to frost. Therefore, it is recommended to wait until the danger of frost has passed before planting outdoors, usually in late spring or early summer.
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Soil type and fertiliser
Celeriac grows best in a sunny or partially shaded location. It thrives in loose, well-drained, rich soil with a slightly acidic to neutral pH range between 6.0 and 7.0. Sandy loam with lots of organic matter, such as well-rotted manure, compost, and worm castings, is ideal for improving soil structure and providing nutrients. Dig this through a few weeks before sowing. If your natural garden soil is heavy or compacted, consider growing celeriac in raised beds.
Celeriac is a heavy feeder, so regular fertilisation is necessary. Use a complete organic liquid fertiliser, worm juice, or compost tea. Avoid nitrogen-rich fertilisers as these will reduce the growth of the root ball, which is the desired part of the plant.
Celeriac grows well with beans, brassicas, carrots, leeks, lettuce, peas, sage, tomatoes, onions, runner beans, silverbeet, and other plants. It can aid the growth of bean, brassica, and cucumber plants. Cauliflowers, cabbages, daisy flowers, leeks, tomatoes, garlic, and beans can also benefit its growth. Avoid growing celeriac near corn plants and plants in the Aster genus, as celeriac can be an asymptomatic host for certain diseases affecting these plants.
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Watering and mulching
Watering celeriac plants regularly is crucial, as they are sensitive to drought. Aim to water them every second day or even daily in hot and dry periods to keep the soil moist. Watering once a week is generally recommended, but increase the frequency to 2–3 times weekly if the soil starts to dry out. Additionally, ensure the soil is moist during germination, which can take 2–3 weeks or longer in cooler conditions.
When it comes to mulching, celeriac benefits from a thick layer of organic mulch, such as sugar cane mulch or pea straw. Mulching helps to maintain a cool root system, retain moisture, and suppress weed growth. It is advisable to mulch well around the plants, especially before hot and dry periods, to ensure the roots stay cool and moist.
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Companion planting
First and foremost, celeriac grows well with beans, brassicas, carrots, leeks, lettuce, peas, tomatoes, and onions. These plants can help improve the growth and flavour of celeriac, as well as deter certain pests. For example, beans can help fix nitrogen in the soil, improving its quality, while onions can help deter pests that may otherwise feast on your celeriac.
However, it is important to avoid planting celeriac with certain types of plants. Sweetcorn, cucumbers, pumpkins, and squash are known to be bad companion plants for celeriac. These plants may compete for nutrients or attract pests that can be detrimental to celeriac. It is recommended to keep a distance of at least 2 metres between celeriac and these plants.
Additionally, when planning your companion planting, consider the spacing between plants. Celeriac requires ample space to grow, so be sure to allow for proper air circulation. A general rule of thumb is to space celeriac plants between 30cm and 50cm apart, with rows at least 40cm apart.
By following these companion planting guidelines and providing the necessary care, you can successfully grow celeriac in Australia and enjoy this tasty and nutritious vegetable.
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Harvesting
Celeriac is a slow-growing plant and requires around 4 to 5 months to reach maturity. The best time to plant celeriac in Australia is in spring, and the seedlings should be around 8 to 12 cm tall before planting. The Giant of Prague variety of celeriac takes between 16 and 18 weeks to reach a size suitable for harvest. Harvest the roots before they reach 14 cm in diameter, as older roots will be tough and fibrous. Smaller bulbs tend to have a sweeter taste and are perfect for adding to salads and purees.
Celeriac is sensitive to drought, so keep the plants well-watered. It is also a heavy feeder, so fertilise your plants regularly with a complete organic liquid fertiliser, worm juice, or compost tea. Celeriac likes growing in loose, well-drained, rich soil. A sandy loam with lots of organic matter, including well-rotted manure, compost, and worm castings dug through a few weeks before sowing, will improve soil structure and provide nutrients.
Celeriac grows best in full sun, but in hot summers, some afternoon shade can prevent drying out. It is also a good idea to grow celeriac in raised vegetable beds if your natural garden soil is too compacted or heavy with clay. Keep the area free from weeds, snails, and slugs. The best fertiliser to use is a low-nitrogen one, as you are looking for root production rather than foliage growth.
To promote further root growth, remove any side shoots when they appear on the plant. After 20 to 28 weeks, when the bulbs are about the size of a tennis ball, carefully remove the bulbous root from the soil. You can leave the bulbs in the ground until late autumn/fall, but be careful of very wet soils, snails, and slugs. Dig the bulbs and store them in a cool, dry, dark position.
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Frequently asked questions
The best time to plant celeriac in Australia varies depending on the region. In cooler regions, sow seeds from October to December. In temperate regions, sow seeds from September to December. In subtropical regions, sow seeds in March, April, September, or October. In tropical regions, sow seeds during the dry season from April to July.
Celeriac grows best in a sunny to partially shaded location with rich, well-drained, loose soil. The soil pH should be slightly acidic to neutral, ranging from 6.0 to 7.0. Keep the soil moist and water regularly, especially during hot and dry periods. Mulch around the plants and fertilize regularly with a low-nitrogen fertilizer to promote root growth.
Celeriac typically takes 14 to 28 weeks to reach maturity and be ready for harvest. The seeds can take up to 3 weeks or longer to germinate, and the seedlings should be around 8-12 cm tall before planting out.


































