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How to Grow Celeriacs UK | Regional Planting Calendar
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In the UK, celeriacs go in the ground early March to late March.
Celeriacs (Apium graveolens var. rapaceum) — annual/biennial, grown as annual.
Timing is the decision that matters most in the UK: there are 4 separate regional sowing windows, ranging from early March in Southern England to early March in Scotland.
Core growing advice on this page is checked against named horticultural and university-extension sources — see References.
RHS: sow indoors in March at 15C; a single window is applied uniformly across all four sub-regions since the source gives no UK-region-specific gradient, and celeriac is started under cover regardless of region.
Midlands - detail & sources
RHS: sow indoors in March at 15C; a single window is applied uniformly across all four sub-regions since the source gives no UK-region-specific gradient, and celeriac is started under cover regardless of region.
Northern England - detail & sources
RHS: sow indoors in March at 15C; a single window is applied uniformly across all four sub-regions since the source gives no UK-region-specific gradient, and celeriac is started under cover regardless of region.
Scotland - detail & sources
RHS: sow indoors in March at 15C; a single window is applied uniformly across all four sub-regions since the source gives no UK-region-specific gradient, and celeriac is started under cover regardless of region.
Sow indoors in March with a light sprinkling of compost over seed, germinating at 15C -- slow and erratic, taking up to 3 weeks; keep above 10C once germinated to prevent bolting (RHS).
Planting out and establishment
1
Transplant outdoors after last frost, usually late May or early June, hardened off first, spaced 30cm apart in rows 40-45cm apart, stem base at soil level; cloches or fleece help reduce bolting risk (RHS).
Leaf growth and crown exposure
3
Keep soil consistently moist and mulched; from summer onwards remove outer leaves as they fall horizontal to expose and encourage the swollen crown, and remove side-shoots and damaged leaves (RHS).
Root swelling and harvest
8
Harvest October through March; extremely hardy, roots can stay in the ground and develop stronger flavour over time; on heavy or waterlogged soils lift and store in late autumn instead (RHS).
When to pick: Takes at least six months to reach maturity; harvest October through the following March; develops stronger flavour over time and can be left in the ground until required; grows large without turning woody
Directly fetched and verified (canonical URL differs from requested URL /biodiversity/slugs -> redirects to /biodiversity/slugs-and-snails). RHS explicitly advises against slug pellets (even organic) due to wildlife harm, and cites RHS's own controlled trial finding no damage reduction from physical barriers (copper tape, bark mulch, eggshell, grit, wool) -- while also noting some other studies have shown copper barriers to repel slugs, a preserved disagreement rather than a silently resolved one. Details Nemaslug (Phasmarhabditis hermaphrodita) biological control including application temperature range and its lack of effect on snails specifically.
6 independent sources are cited for this crop. Where they disagree - soil pH is the clearest case - every figure is preserved rather than averaged into false precision.
Frequently Asked Questions
When should I sow celeriacs in the UK?
In Southern England, from early March. In Scotland, wait until early March. Treat these as a guide rather than a fixed date — the governing rule is to sow only once frost risk has passed and temperatures are reliably warm enough.
When do I sow celeriacs?
Sow early March to late March.
What soil pH do celeriacs need?
A pH of about 6–6.8. That span reflects genuine variation between the authorities we cite rather than a single agreed figure — the References section lists each source's exact range.
What problems affect celeriacs?
Our data links 1 disease and 3 pests to this crop. See the sections above for each one and how to manage it.
Plan next season before the problems start
Most of the advice on this page comes down to timing and spacing — sowing at the right moment, rotating beds, and giving plants enough airflow. The UK Garden Planner lays your plot out month by month so those decisions are already made before the season starts.
UK vegetable growing guides · Checked against RHS & Met Office guidance
Every SoilCommander guide is written and maintained by our editorial team for real UK growing conditions, and reviewed against Royal Horticultural Society growing advice and Met Office climate data before publication.
Sketch your exact plot shape, pick your UK crops, and get a spacing-accurate bed layout with companion pairings, a rotation plan and month-by-month sowing dates — every fact sourced from RHS and Garden Organic.
