---
title: How to Grow Celeriac from Seed
description: Learn how to successfully grow celeriac from seed with our step-by-step guide, including tips on soil, watering, and ideal growing conditions.
---

[How to Garden! ](https://www.theonlinegardencenter.com/how-to-garden)

# [How to Grow Celeriac from Seed](https://www.theonlinegardencenter.com/how-to-garden/how-to-grow-celeriac-from-seed)

 Written by [Mark Foley](https://www.theonlinegardencenter.com/how-to-garden/author/mark-foley) | 3/23/26 12:08 PM

## How to Grow Celeriac from Seed

Celeriac is a slow-growing root vegetable grown for its large, knobbly bulbs with a mild celery flavour. Starting from seed early gives plants enough time to develop properly before harvest in autumn.

It requires patience, but with steady care you can produce high-quality roots at home.

## Quick answer: how to grow celeriac from seed

To grow celeriac from seed, sow seeds on the surface of moist compost, keep them at 18–21°C, and place in a bright location. Keep soil consistently moist, transplant seedlings as they grow, and maintain steady watering throughout the season.

## Step-by-step guide to growing celeriac from seed

Step 1: Choose containers and compost

- Use seed trays or small pots with drainage
- Fill with **fine seed compost**
- Lightly firm the surface

Step 2: Sow the seeds

- Scatter seeds thinly on the surface
- Do not bury deeply — seeds need **light to germinate**
- Lightly press into the compost

Step 3: Provide warmth

- Keep at **18–21°C for germination**
- Use a propagator or warm indoor space
- Germination can be slow

Step 4: Water and provide light

- Mist or water gently
- Keep compost **consistently moist**
- Place in a **bright position** once seedlings appear

Step 5: Transplant and grow on

- Prick out seedlings when large enough to handle
- Pot on into larger containers
- [Harden off](https://www.theonlinegardencenter.com/how-to-garden/how-to-harden-off-seedlings?hsLang=en) before planting outdoors

## When to sow celeriac seeds

Celeriac should be started:

- In **early spring indoors**
- Early sowing is essential due to slow growth
- Requires a long growing season

Seeds can take **2–3 weeks (or longer)** to germinate.

## Best celeriac varieties

- Monarch 
    - Smooth bulbs
    - Good disease resistance
- Giant Prague 
    - Large roots
    - Reliable performance
- Prinz 
    - Compact and uniform
    - Good for smaller spaces

Choose based on **size, uniformity, and growing space**.

## Ideal growing conditions

- Temperature 
    - Moderate warmth (18–21°C early on)
- Light 
    - Bright light after germination
- Soil 
    - Rich, moisture-retentive soil
- Water 
    - Consistent moisture is essential
    - Avoid letting soil dry out

Celeriac needs steady conditions to develop good-sized roots.

## Common problems

Poor germination

- Cause: low temperature or old seed
- Fix: increase warmth and use fresh seed

Small roots

- Cause: poor nutrition or inconsistent watering
- Fix: improve soil and maintain moisture

[Bolting](https://www.theonlinegardencenter.com/how-to-garden/what-is-bolting-in-plants?hsLang=en)

- Cause: temperature stress
- Fix: avoid sudden cold exposure

Leggy seedlings

- Cause: insufficient light
- Fix: move to a brighter location

## Climate and regional notes

UK & Ireland

- Start indoors early for best results
- Needs a long growing season

Europe

- Northern regions require early sowing
- Southern regions may sow earlier

USA

- Start indoors 10–12 weeks before last frost
- Requires steady growing conditions

## Pro tips for better results

- Use fresh seed for better germination
- Space plants well when transplanting
- Feed regularly once established
- Keep soil consistently moist
- Remove outer leaves to improve bulb development

## FAQs: growing celeriac from seed

**When should I sow celeriac seeds**  
In early spring indoors to allow enough time for growth.

**Do celeriac seeds need light to germinate**  
Yes, they should be sown on the surface.

**How long does celeriac take to germinate**  
Usually 2–3 weeks, sometimes longer.

**Why are my celeriac roots small**  
Often due to poor soil, lack of nutrients, or inconsistent watering.

**Can I grow celeriac in containers**  
Yes, but use deep containers and maintain moisture.

**How often should I water celeriac**  
Keep soil consistently moist at all times.

**What soil is best for celeriac**  
Rich, fertile, moisture-retentive soil.

**When can I harvest celeriac**  
In autumn once roots have reached a good size.

**Does celeriac need feeding**  
Yes, regular feeding improves root development.

**How long does celeriac take to grow**  
Several months from sowing to harvest.

[View full post](https://www.theonlinegardencenter.com/how-to-garden/how-to-grow-celeriac-from-seed)

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