Can you grow celeriac hydroponically? Yes, celeriac hydroponics works best in a deep media bed or Dutch bucket, not a shallow NFT channel, because the root bulb needs support. No published celeriac hydroponic trial exists, so use soil guidance: UC Master Gardeners give 100 to 150 days to maturity and mild 50 to 75°F (10 to 24°C) temperatures.
Key takeaway: Celeriac hydroponics is possible but slow. Celeriac (*Apium graveolens* var. *rapaceum*) is a celery relative grown for its knobby root, and it needs 100 to 150 days, steady water and mild temperatures. We found no published hydroponic trials, so this guide pairs extension soil data with clearly marked hydroponic guidance.
| Factor | Target | Source |
|---|---|---|
| Growing temperature | 50 to 75°F (10 to 24°C) | UC Master Gardeners |
| Germination temperature | 70 to 75°F (21 to 24°C); seed needs light | SARE; UC Master Gardeners |
| Seedling growth temperature | 60 to 70°F (16 to 21°C) | SARE |
| Bolting risk | Below 45°F (7°C) for more than 10 days | SARE |
| Days to maturity | 100 to 150 days | UC Master Gardeners |
| Harvest size | 3 to 6 inches (8 to 15 cm) across | UC Master Gardeners; SARE |
| pH and EC in hydroponics | pH 5.8 to 6.2; EC 1.8 to 2.4 mS/cm | Our guidance |
Can You Grow Celeriac Hydroponically?
Yes, but celeriac hydroponics is an experiment rather than a proven method. We found no peer-reviewed celeriac hydroponic study. Its close relative celery grows well hydroponically, as our hydroponic celery guide shows. The main challenge is the swollen root bulb, which needs a deep, supporting medium (our guidance).
- Best systems for celeriac hydroponics: Dutch buckets or deep media beds with perlite or coco.
- Possible: deep water culture with a wide net pot collar, though the bulb may rot.
- Avoid: shallow NFT channels; the bulb has no room to swell.
SARE calls celeriac a finicky crop because growers struggle to supply enough nitrogen and water. Celeriac hydroponics can solve the water part (our guidance).
What pH, EC and Temperature Does Hydroponic Celeriac Need?
In celeriac hydroponics, keep plants at 50 to 75°F (10 to 24°C), the range UC Master Gardeners give for success. SARE lists a soil pH of 6.0 to 6.4. For celeriac hydroponics, we suggest a solution pH of 5.8 to 6.2 and an EC of 1.8 to 2.4 mS/cm, similar to celery (our guidance). Avoid long cold spells, which trigger bolting.
- pH: 5.8 to 6.2 for the solution; see pH up and down.
- EC: 1.8 to 2.4 mS/cm; see EC and TDS.
- Cold: SARE warns against exposure to 45°F (7°C) for more than 10 days.
- Night minimum: SARE keeps greenhouses at 55°F (13°C) or warmer.
SARE lists total uptake per acre of 105 lb (118 kg/ha) nitrogen, 16 lb (18 kg/ha) phosphorus and 160 lb (179 kg/ha) potassium, so the crop is potassium-hungry. For celeriac hydroponics, use a complete vegetable formula with good potassium (our guidance).
How Do You Start Celeriac Seeds for Hydroponics?
Celeriac hydroponics starts with tiny, slow seeds. UC Master Gardeners say they need light to germinate and may take 2 weeks or longer, and rarely will all seeds sprout. SARE gives a germination temperature of 70 to 75°F (21 to 24°C), then 60 to 70°F (16 to 21°C) for seedling growth. Start them 10 to 12 weeks before transplanting.
- Sow seeds on the surface of rockwool cubes or plugs; do not bury them.
- Keep moist and at 70 to 75°F (21 to 24°C); see seed germination temperature.
- Give light from day one.
- Feed at quarter strength once true leaves appear (our guidance).
- Transplant when seedlings have at least 2 true leaves, as SARE advises.
- Set the crown at the surface; SARE warns a buried crown stops growth.
How Long Does Hydroponic Celeriac Take to Harvest?
Celeriac hydroponics is a long-season project. UC Master Gardeners plan on 100 to 150 days to maturity, and they suggest lifting roots when they reach 3 to 4 inches (8 to 10 cm) across or slightly larger. SARE describes ready roots as 3 to 6 inches (8 to 15 cm) in diameter. Hydroponic timing is untested and may be faster (our guidance).
- Harvest: cut the stems close to the root and trim side roots.
- Second year: UC notes plants left a second year grow tall stems and pithy roots, since celeriac is biennial.
- Storage: SARE stores celeriac at 32 to 36°F (0 to 2°C) and 97 to 98% humidity.
How Do You Care for Celeriac as the Root Swells?
As the bulb swells in celeriac hydroponics, care matters. UC Master Gardeners say celeriac is shallow-rooted and needs even, regular moisture. They also advise snipping off side roots as the main root swells. In a Dutch bucket, keep the medium evenly moist with short, frequent drip cycles, and remove lower leaves that yellow (our guidance).
- Side roots: trim small roots on the upper bulb for a smoother shape.
- Blanching: UC hills soil over the bulb; in media you can mound perlite (our guidance).
- Spacing: UC spaces plants 10 to 12 inches (25 to 30 cm) apart; SARE uses 12 inches (30 cm).
- Pests: UC lists celery leaf miners, snails and slugs.
Which Celeriac Varieties Suit Hydroponics?
No variety has been tested for celeriac hydroponics, but compact, smooth types are easier to manage. UC Master Gardeners list ‘Brilliant’ for nearly fiberless white roots, ‘Diamant’ for roots that sit above ground for easy harvest, ‘Yara’ as slow to bolt, and ‘Monarch’ for easy-peel skin. SARE also names ‘Diamant’ and ‘Brilliant’.
- ‘Diamant’: sits high, which suits a media bucket (our guidance).
- ‘Yara’: a good choice if your room cools at night.
- Related roots: compare hydroponic beets and hydroponic turnips for faster crops.
FAQ About Celeriac Hydroponics
Is celeriac hydroponics practical?
It works in deep media, but it is slow and untested in trials.
What system is best for celeriac?
A Dutch bucket or deep media bed.
Why did my celeriac bolt?
Cold below 45°F (7°C) for more than 10 days can trigger it.
How long does celeriac take?
About 100 to 150 days from transplant to harvest.
Can I grow celeriac in DWC?
Possibly, but the bulb may rot if it sits in water.
Do celeriac seeds need light?
Yes; sow on the surface.
Sources
- SARE — Celeriac (Northeast Crop Production and Harvest Manual)
- UC Master Gardener Program of Sonoma County — Celeriac
- Photo credits (Wikimedia Commons, edited with titles): Celery root (8047803896) by Leslie Seaton from Seattle, WA, USA (CC BY 2.0); -2021-06-08 Celeriac plants, Trimingham by Kolforn (Kolforn) I’d appreciate if you could mail me (Kolforn@gmail.com) if you (CC BY-SA 4.0)