UK sowing calendar
When to sow collard greens in the UK
Collard greens sowing calendar (UK)
| Sow under cover | Feb-Mar |
|---|---|
| Sow / plant outdoors | Apr-Aug |
| Harvest | Aug-Mar |
A hardy leafy brassica grown much like kale, and frost improves the flavour. Direct-sow Apr-Jul for autumn/winter picking, or Jul-Aug for overwintered spring greens; no RHS-dedicated page, so timing follows UK kale/spring-greens practice.
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 collard greens.
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When to sow collard greens in the UK — FAQs
When should I sow collard greens in the UK?
Sow collard greens under cover Feb-Mar, then outdoors apr-aug. A hardy leafy brassica grown much like kale, and frost improves the flavour. Direct-sow Apr-Jul for autumn/winter picking, or Jul-Aug for overwintered spring greens; no RHS-dedicated page, so timing follows UK kale/spring-greens practice.
Can you sow collard greens outdoors in the UK?
Yes — sow or plant collard greens outdoors apr-aug. Wait until after the last frost (around mid-May, later in the north) for anything tender.
When is collard greens ready to harvest in the UK?
Collard greens is typically harvested Aug-Mar in the UK, depending on your sowing date, cultivar and region.
Is it too late to sow collard greens?
It depends on the month and your region. Collard greens has a UK outdoor window of apr-aug; 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.