GrowSabzHow to grow celeriac in pots
Also called Celery Root, Turnip-rooted Celery, Knob Celery, celery root · Apium graveolens var. rapaceum
سیلیریک
- ☀️ Sunlight
- 6–8hours daily
- 💧 Water
- 1.3 Levery 2 days, 10 L pot
- 🌡️ Ideal temp
- 13–21°C
- 🪴 Min pot
- 10 L25 cm deep
- 🧺 Harvest
- 90–120days from sowing
- ⚖️ Yield
- 1 kgper 20 L pot
Celeriac drinks far more than most container plants — about 1000 ml for every 10 litres of soil, and in hot weather it wants that every single day. Underestimate that and you get the classic result: a plant that looks healthy in the morning and wilts by afternoon.
Short answer
Grow celeriac in a 10 litre container at least 25 cm deep, watering about 1000 ml per 10 litres of soil every 2 days, and keep temperatures between 13 and 21 °C. First harvest comes 90–120 days after sowing.
Where to plant it
What size pot does celeriac need?
10 litres and 25 cm deep is the realistic minimum for a single plant. Pick a container below to see what changes.
| Container | Minimum size | Depth | Notes |
|---|---|---|---|
| Pot | 10 L | 25 cm | Requires consistent moisture and good drainage. |
| Grow bag | 10 L | 25 cm | Fabric bags help with aeration but dry out faster. |
| Open ground | — | 30 cm | Ensure rich, well-drained soil. |
| Raised bed | 20 L | 30 cm | Ideal for controlling soil conditions and drainage. |
Watering
How often should you water celeriac?
Every 2 days through the growing season, at about 1000 ml per 10 litres of soil — daily in hot weather, every 3 days when it turns cool. Water in the early morning. Drip irrigation or consistent soil watering works best.
Too little water
- stunted growth
- tough roots
- splitting roots
Too much water
- yellowing leaves
- stunted growth
- root rot
Avoid: letting soil dry out completely; standing water; overhead watering in high humidity.
Climate
Can you grow celeriac where you live?
No hardiness zone needed — compare your actual temperatures against the plant's own limits.
| Ideal range | 13 – 21 °C |
|---|---|
| Survives | -4 – 27 °C |
| Germinates above | 10 °C — best at 20 °C, about 14 days |
| Flowers drop | above 25 °C, or below 5 °C |
| Sunlight | 6–10 hrs/day, best 8 |
| Frost | Medium sensitivity |
The flower-drop thresholds matter more than the survival ones. A plant can be perfectly alive at 27 °C and still give you nothing.
How cold is too cold for celeriac? Check your temperaturesEnter your night low and day high — see if it survives, and if it will cropTimeline
Celeriac growing stages, day by day
Click any stage to see what's happening. Durations shift with temperature — a warm season runs roughly a quarter faster than a cool one.
Feeding
Fertiliser schedule for celeriac
Feed on the interval below, changing what you give as the plant shifts from making leaves to making fruit.
| Stage | What to use | Per 10 L | Every |
|---|
How to prepare each feed
Common mistakes
Why celeriac fails, and how to avoid it
- A container that is too small
Below 10 litres the root run is too shallow. The plant grows, flowers late, and drops whatever it sets because it cannot support the crop.
- Watering too lightly
A daily splash wets the top few centimetres and nothing else. Celeriac wants about 1000 ml per 10 litres of soil — one deep soak beats three shallow ones.
- Ignoring the flower-drop threshold
Above 25 °C, or below 5 °C, flowers fall before setting. The plant can look perfectly healthy and still give you nothing — shade it through the hottest hours.
- Harvesting too late
Left too long the colour changes, seeds harden and the flavour sharpens. Pick on the signs listed below, not on the calendar.
- Planting it beside Carrot
Competes for similar nutrients and space, and attracts the same pests like carrot rust fly.
Companions
What to plant with celeriac
Good neighbours
Fix nitrogen in the soil, benefiting celeriac's growth, and can deter some pests.
Acts as a living mulch, keeping the soil cool and moist, and suppressing weeds around celeriac.
Breaks up heavy soil, improving drainage and aeration for celeriac roots.
Deters slugs, snails, and some other pests. (Plant in containers to prevent invasiveness).
Roots release chemicals that deter root-knot nematodes, protecting celeriac roots.
Keep apart from
Competes for similar nutrients and space, and attracts the same pests like carrot rust fly.
Produces substances that inhibit the growth of many plants, including celeriac.
Can stunt the growth of celeriac and other root vegetables.
Competes heavily for nutrients and water, and can share similar diseases.
Problems
Celeriac pests and diseases
Each lists the weather that brings it on, so you know when to start checking rather than reacting once it's established.
Celery Leaf Spot humidity >80% · temp 15-25
Small, yellow spots appear on older leaves, enlarging and turning brown with black dots (pycnidia). Can lead to severe defoliation.
Celery Heart Rot humidity high · temp warm · soil_drainage poor
A soft, watery decay develops in the center of the celeriac bulb, often starting from the crown. Caused by bacterial infection.
Aphids humidity any · temp 15-25
Small, soft-bodied insects cluster on new growth and undersides of leaves, sucking sap and causing distorted growth. May transmit viruses.
Slugs Snails humidity high · temp cool, wet
Chew irregular holes in leaves and can damage the developing celeriac root, especially in moist conditions.
Carrot Rust Fly humidity moist · temp cool
Larvae tunnel into the celeriac root, creating rust-colored channels and making the root unmarketable. Strong carrot scent attracts them.
Leaf Miners humidity any · temp warm, dry
Larvae create winding tunnels (mines) within the leaves, reducing photosynthesis and weakening the plant.
Bolting humidity any · temp sudden fluctuations (cold then hot), prolonged cold
Premature development of a flower stalk, diverting energy from root growth. Makes the celeriac root woody and inedible.
Cracked Roots Stems humidity any · temp any · watering uneven · soil_nutrient boron deficiency
Stems and roots develop cracks, often accompanied by browning of the heart. Caused by inconsistent watering or boron deficiency.
Harvest
When to harvest celeriac
First picking falls between day 90 and day 120.
How to tell it's ready
- Root (corm) is 3-5 inches (7-12 cm) in diameter and firm.
- Leaves may start to yellow slightly.
How much to expect
Storing it: Store in a cool, moist place (e.g., root cellar, refrigerator crisper) for several months. Can also be blanched and frozen.
Questions
Celeriac: common questions
How long does celeriac take to grow?
About 100 days from sowing to the first harvest, with picking usually starting between day 90 and day 120. Warm weather pulls that forward; cool weather pushes it back.
What size pot does celeriac need?
At least 10 litres and 25 cm deep for one plant. A raised bed wants 20 litres of soil and 30 cm of depth.
How often should I water celeriac?
About 1000 ml per 10 litres of soil, every 2 days in normal weather — daily when it is hot and every 3 days when cool. Water in the early morning.
What temperature does celeriac need?
It does best between 13 °C and 21 °C and survives from -4 °C to 27 °C. Seed needs soil above 10 °C to germinate, ideally around 20 °C.
Can I grow celeriac in winter?
It tolerates cold better than most, down to about -4 °C, so a sheltered spot or a cold frame will often carry it through.
How do I know when celeriac is ready to harvest?
Root (corm) is 3-5 inches (7-12 cm) in diameter and firm.; Leaves may start to yellow slightly.. Once picked: store in a cool, moist place (e.g., root cellar, refrigerator crisper) for several months. can also be blanched and frozen.
How much does one celeriac plant produce?
Roughly 1 kg from a 20 litre container, or about 2 kg in open ground. Larger containers give proportionally more, up to a point.