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How to Grow
How to Grow Marrowstem Kale UK | Regional Planting Calendar
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PFAF: direct seed outdoors April/May, with no UK-region-specific dates given; this window is applied across all four sub-regions rather than inventing a north/south gradient the source does not support.
Midlands - detail & sources
PFAF: direct seed outdoors April/May, with no UK-region-specific dates given; this window is applied across all four sub-regions rather than inventing a north/south gradient the source does not support.
Northern England - detail & sources
PFAF: direct seed outdoors April/May, with no UK-region-specific dates given; this window is applied across all four sub-regions rather than inventing a north/south gradient the source does not support.
Scotland - detail & sources
PFAF: direct seed outdoors April/May, with no UK-region-specific dates given; this window is applied across all four sub-regions rather than inventing a north/south gradient the source does not support.
When to pick: Prized for winter harvesting in cold climates; extremely cold-tolerant to about -15C. Foliage toughens with age, so leaves are best used young; young flowering shoots taste similar to sprouting broccoli when cooked (PFAF).
Unlike other kales it is grown for a stem that thickens club-like from about 1cm to 4-5cm, traditionally cut for winter fodder and equally edible young.
A secondary gardening reference rather than a university or horticultural authority, used as the sole source for this heritage forage/fodder kale as no RHS or equivalent authority growing profile exists for it, explicitly disclosed. A biennial/perennial plant reaching 0.9m (3ft) tall. Foliage has a strong cabbage flavour, becoming tougher as it ages. Young flowering shoots taste similar to sprouting broccoli when cooked. Native to European coasts including the UK, Germany, Spain and France -- a cultivated form, not found wild. Extremely cold-tolerant, withstanding temperatures down to about -15C, and tolerates high summer heat. Adaptable to full sun, semi-shade or shade, performing well on a north border. Soil: light, medium or heavy; pH 4.2-8.3; prefers well-drained, fertile, heavy soil, succeeds in heavy clay. Propagate by direct seeding outdoors April/May in a seedbed; transplant summer seedlings to permanent positions, avoiding overcrowding to prevent legginess; deeper planting encourages root formation. Not often cultivated for its edible leaves specifically, due to coarser texture than other kale varieties, but prized for winter harvesting in cold climates. Traditionally grown as a tall dairy-cattle forage crop for autumn use, as distinct from the dwarf Thousandhead type grown for sheep in winter.
1 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 marrowstem kale in the UK?
In Southern England, from early April. In Scotland, wait until early April. 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 marrowstem kale?
Sow early April to late May.
What soil pH do marrowstem kale need?
A pH of about 4.2–8.3. 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 marrowstem kale?
Our data links 2 diseases and 2 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.
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