UK sowing calendar
When to sow celery in the UK
Celery sowing calendar (UK)
| Sow under cover | Mar-Apr |
|---|---|
| Sow / plant outdoors | May-Jun (plant out) |
| Harvest | Aug-Oct |
Sow under cover mid-Mar to Apr - seed needs light and at least 15C to germinate. Plant out only once frost has passed (late May-Jun); temperatures below 10C can trigger bolting, so don't rush it outside.
UK timing runs on the last-frost date, not a USDA zone. Most of Britain sees its last frost around mid-May, with the north and exposed inland gardens a week or two later and the mild south-west and coast earlier. Tender crops start under cover and only go out once frost has passed; hardy crops can be direct-sown as soon as the soil is workable.
Timing aligned with the RHS grow-your-own guide for celery.
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When to sow celery in the UK — FAQs
When should I sow celery in the UK?
Sow celery under cover Mar-Apr, then outdoors may-jun (plant out). Sow under cover mid-Mar to Apr - seed needs light and at least 15C to germinate. Plant out only once frost has passed (late May-Jun); temperatures below 10C can trigger bolting, so don't rush it outside.
Can you sow celery outdoors in the UK?
Yes — sow or plant celery outdoors may-jun (plant out). Wait until after the last frost (around mid-May, later in the north) for anything tender.
When is celery ready to harvest in the UK?
Celery is typically harvested Aug-Oct in the UK, depending on your sowing date, cultivar and region.
Is it too late to sow celery?
It depends on the month and your region. Celery has a UK outdoor window of may-jun (plant out); northern and exposed gardens run a week or two behind the south. Open Growli and tell it your postcode for timing tuned to your own last-frost date.