How to grow celariac plants

Posted by Marshalls Garden on

Celeriac, also known as celery root, is a versatile and flavourful root vegetable that's gaining popularity in kitchens and gardens alike. Its nutty flavour and smooth texture make it an excellent addition to soups, stews, and salads. In this blog, we'll guide you through the process of growing celeriac, from planting to harvest.

Why Grow Celeriac?

Celeriac is not only delicious but also packed with nutrients, including vitamins C and K, phosphorus, and potassium. Growing celeriac in your garden allows you to enjoy fresh, organic produce while adding a unique twist to your culinary creations.

Preparing to Grow Celeriac

Selecting the Right Variety

Before you start, choose the right celeriac variety for your garden. Popular varieties include:

  • Prinz: Known for its smooth texture and uniform shape.

  • Monarch: A reliable variety with good disease resistance.

  • Giant Prague: Ideal for those looking for larger roots.

When to Plant

Celeriac is a cool-season crop that requires a long growing season of about 120 to 140 days. Start seeds indoors 8 to 10 weeks before the last expected frost date in your area.

Planting Celeriac

Starting Seeds Indoors

  1. Sow Seeds: Fill seed trays with a seed-starting mix and sow celeriac seeds 1/4 inch deep. Lightly cover with soil and water gently.

  2. Provide Light: Place the trays under grow lights or in a sunny window. Celeriac seeds require light to germinate.

  3. Maintain Moisture: Keep the soil consistently moist but not waterlogged.

  4. Temperature: Maintain a temperature of 60-70°F (15-21°C) for optimal germination.

Transplanting Outdoors

  1. Harden Off: About two weeks before transplanting, harden off the seedlings by gradually exposing them to outdoor conditions.

  2. Prepare Soil: Choose a sunny location with well-drained, fertile soil. Incorporate plenty of organic matter, such as compost, to enrich the soil.

  3. Spacing: Plant seedlings 6-8 inches apart in rows spaced 18-24 inches apart.

  4. Planting Depth: Plant the seedlings at the same depth they were in their pots.

Caring for Celeriac


Celeriac needs consistent moisture throughout the growing season. Water regularly to keep the soil evenly moist, but avoid waterlogging.


Feed celeriac plants with a balanced fertiliser every 4-6 weeks. Alternatively, use a side dressing of compost or well-rotted manure to provide nutrients.


Apply a layer of mulch around the plants to conserve moisture, suppress weeds, and keep the roots cool.


Thin the plants if they become overcrowded to ensure good air circulation and root development.

Pests and Diseases

Celeriac is relatively pest-resistant, but keep an eye out for common garden pests such as aphids, slugs, and snails. Use organic pest control methods like neem oil or introduce beneficial insects to manage pest populations.

Harvesting Celeriac

Celeriac is ready to harvest when the roots are about 3-4 inches in diameter, typically in late autumn before the first hard frost. Use a garden fork to carefully lift the roots from the soil. Trim off the foliage and store the roots in a cool, dark place.

Tips for Storing Celeriac

  • Refrigeration: Store celeriac in the refrigerator in a perforated plastic bag for up to several weeks.

  • Cellar Storage: For longer storage, place the roots in a cool, damp cellar with high humidity.

Enjoying Your Celeriac

Now that you've successfully grown and harvested your celeriac, it's time to enjoy it! Peel and chop the roots for roasting, mashing, or adding to soups and stews. Celeriac's unique flavor will add a delicious twist to your favorite recipes.

Growing celeriac may require a bit of patience, but the reward is a unique and nutritious root vegetable that enhances your garden and your table. With the right care and attention, you'll be enjoying homegrown celeriac in no time. Happy gardening!

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