Starbor: een plek in jouw tuin
Ontdek Starbor en kies hoe je boerenkool wilt kweken. Hieronder staan de bevestigde rasgegevens en de praktische teeltgids voor deze groente.

This image was created with AI from described plant characteristics and growing advice. It shows a possible situation and is not a photograph of a verified cultivar.
- Growing
- Young leaves or winter plants
- Location
- Sun to light partial shade
- Harvest
- Outer leaves, leaving the heart to grow
- Protection
- Mesh where feeding damage is a problem
This growing advice helps you choose. Your variety, growth stage, weather and conditions in your space determine the actual timing.
Sowing under cover and raising seedlings
Start under cover in cool conditions in modules or a seedbed · Kale
April–JuneStart under cover in cool, bright conditions to suit the desired harvest time.
- Germination and temperature
- Germinate under cover, then grow on in cool, bright, well-ventilated conditions; avoid a hot growing space.
- After emergence
- Give seedlings light immediately after emergence. A dark loft needs suitable grow lights; warmth alone is insufficient. Ventilate and keep the compost moist without saturating it.
- Pricking out and potting on
- Sow in modules or prick out manageable young plants. Let the root ball firm up without a check in growth.
- Hardening off and planting out
- Gradually acclimatise indoor-raised plants to sun, wind and outdoor temperatures; shelter them again on cold nights. Plant out sturdy young brassicas and protect against cabbage root fly and caterpillars where needed.
Plan for young leaves or mature winter plants. Portuguese cabbage is not automatically as winter-hardy as kale.
Sources and use
RHS · bladkool ↗Britse teeltrichtlijn voor een gematigd klimaat; de genoemde perioden zijn richtlijnen voor Nederland en Vlaanderen.
Feggies · Boerenkool westlandse herfst – biologische groentezaden ↗Nederlandse producent of teeltbron; de rasinstructie blijft leidend.
Feggies · Boerenkool Westlandse herfst zaden organic ↗Nederlandse producent of teeltbron; de rasinstructie blijft leidend.
Guideline periods for the Netherlands and Flanders. Check the variety, available light, soil and measured temperatures. Greenhouse heating does not guarantee enough winter light.
How to grow kale
The options below belong to the plant. From these, choose the method that suits your variety's growth habit.

This image was created with AI from described plant characteristics and growing advice. It shows a possible situation and is not a photograph of a verified cultivar.
A row for autumn and winter picking
Established plants make the autumn bed useful.
- Choose a variety with documented winter growing.
- Plant with sufficient width for mature size.
- Pick usable outer leaves and retain the growing head.
For a vegetable garden with room in summer and winter.
Tick off your supplies →
This image was created with AI from described plant characteristics and growing advice. It shows a possible situation and is not a photograph of a verified cultivar.
Baby leaves in a container
A short crop can provide small, fresh leaves.
- Follow the variety's baby leaf instructions.
- Sow small rounds in a large container with drainage.
- Harvest young and resow once quality declines.
For small portions and limited space.
Tick off your supplies →Choose by flavour, shape and use
Westlandse Herfst: Westlandse Herfst is a curled kale selection for the cooler part of the season. Its firm leaves add volume to the winter bed. Cut thick veins separately and use finely sliced leaves in stamppot or a stir-fry. This lets you control texture.
In kale, cold conditions can make the perceived flavour milder. This is crop information, not an exclusive feature of this selection.
Grand vert du Nord: Tall green curly kale from northern France. The source describes substantial plants with abundant curly leaves. Use in mashed potato or finely sliced as a cooked vegetable base. Process thicker veins separately if desired.
Traditional appreciation after cold is a kale characteristic. A distinct aroma ranking for this cultivar has not been established.
Gulag Stars: A gene-pool selection with varied leaf shapes and colours. Variation between plants is part of the offering. Combine young leaves from different plants in a cooked dish. Select softer leaves when you want a fine texture.
The source mentions soft texture and good flavour, but no detailed aroma. Plants within this population may differ.
Siber Frill: Siber Frill has blue-green, strongly curled leaves. The firm leaf structure gives a distinctly different appearance from flat-leaved cabbage types. Use finely sliced leaves in a stir-fry or cook them gently in a stew. Adapt the cooking method to their firmness.
Seed producer Redwood Seeds describes Siber Frill as mild and sweet. This is a cultivar description, without fixed sweetness at every harvest stage.
An old leafy vegetable with many faces
Kale has a long place in European and Asian vegetable gardens; RHS describes this at species level. Your bed restarts the story with practical leaf choices. Green and purple varieties differ visually, while compact plants need different layouts from tall forms.
First choose between baby leaves and a mature plant
Baby leaves and winter plants share species but differ in aims. Follow young dense-sowing guidance for baby leaves. Plants staying months need growing room. Label harvest aims so later spacing and calendar choices make sense.
Match the start to the final position
Modules can preserve intact roots at transplanting. Acclimatise indoor plants gradually. Judge actual sturdy growth and suitable root balls, not dates alone. Water young plants to ensure good root-soil contact.
A small plant already calls for a big decision
Use variety guidance for final sites. De Bolster's Westlandse Winter spacing differs from general cabbage advice, for example. Keep paths recognisable. You need lower-leaf access and views underneath without repeatedly working through other plants.
The root zone still matters beneath full foliage
Kale likes draining soil with organic matter. Check beneath surfaces in drought. American guidance links water stress and heat to sharper leaves. Use this to monitor conditions; taste changes alone do not identify the local cause.
Include protection in your garden round
The British growing guide describes insect mesh on a supporting structure and protection from birds. Check the cover seals well and still leaves enough space above plants. Remove yellowing lower leaves where needed. If you see feeding or other damage, inspect leaves carefully before assuming one cause and choosing a measure.
Harvest leaves and leave room for what follows
For individual leaf harvesting, start outside with usable leaves and let others grow on. Observe plant development during every round. This approach gives you something different from one end date for the whole bed. Baby leaves also have their own harvesting approach; follow the chosen cultivar and growing aim.
A winter bed needs continued observation
The Dutch school gardening handbook describes winter harvesting of mature kale from November to March. This guides planning rather than guaranteeing every plant remains harvestable in every winter. Cold can halt growth. Note usable leaves, weather and subsequent plant response; this creates your own story for the next kale bed.
Match sowing to the harvest aim
For a winter plant, start within the cultivar’s sowing or planting window and give the crop time to grow large before the cold months. Baby leaves occupy the space for less time. Plan room after an early harvest, but do not wait until late autumn and still expect a substantial winter plant.
For holes, look beneath the leaves too
Caterpillars, eggs and damage often lie beneath leaves. Under mesh, check closures and trapped pests regularly. For wilting in wet soil, inspect roots; more water does not automatically help. Remove diseased material carefully.
What you need
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More background, sources and image information
SeedSteps editorial team · updated on 11 October 2026. The AI images illustrate species and practical growing situations; they do not prove an exact cultivar, observations from your own garden or yield.
Britse gewasadviezen worden gecombineerd met Nederlandse en Vlaamse informatie waar beschikbaar. Amerikaanse Extension-bronnen ondersteunen plantprincipes en herkenning; hun kalenderdata, lokale plaagdruk, bestrijdingsmiddelen en mestdoseringen worden niet rechtstreeks op Nederland of Vlaanderen toegepast. Vorst, bodemwarmte, standplaats en expliciete rasinformatie blijven de lokale controle. Commerciële bronnen onderbouwen uitsluitend benoemde ras- en plantkenmerken; zij zijn geen affiliate-aanbeveling.
- World Checklist of Vascular Plants — 4 juni 2026Royal Botanic Gardens, Kew · accessed 2026-10-07
- Common catalogue of varieties of vegetable species — 27 januari 2023Europese Commissie · accessed 2026-10-07
- Handboek Schooltuinen: raskeuze en plantuiHandboek Schooltuinen, via Velt · accessed 2026-10-08
- Boerenkool rood zaden biologischFeggies · accessed 2026-10-11
- Boerenkool westlandse herfst – biologische groentezadenFeggies · accessed 2026-10-11
- Boerenkool Westlandse herfst zaden organicFeggies · accessed 2026-10-11
- Krulkool Grand vert du Nord (boerenkool) zaden biologischFeggies · accessed 2026-10-11
- Siberische Boerenkool Gulag StarsFeggies · accessed 2026-10-11
- Siberische Boerenkool Siber FrillFeggies · accessed 2026-10-11
- Gulag Stars: Siberian kale gene poolAssociation Kokopelli · accessed 2026-10-11
- Siber Frill KaleRedwood Seeds · accessed 2026-10-11
- Westlandse Winter: blad, jonge oogst en winterteeltDe Bolster · accessed 2026-10-08
- Boerenkool als oude bladgroenteRoyal Horticultural Society · accessed 2026-10-08
- Boerenkool: groeivormen, verzorgen en oogstenRoyal Horticultural Society · accessed 2026-10-08
- Bladgroenten: verzorgen, koelte en bladoogstUniversity of Maryland Extension · accessed 2026-10-08
- Bladkolen: wortels, water en afzonderlijke bladeren oogstenUniversity of Minnesota Extension · accessed 2026-10-08
Supporting evidence by chapter: Choose by flavour, shape and use: Feggies, Feggies, Feggies, Feggies, Association Kokopelli, Feggies, Redwood Seeds. An old leafy vegetable with many faces: Royal Horticultural Society, Royal Horticultural Society. First choose between baby leaves and a mature plant: De Bolster, Royal Horticultural Society. Match the start to the final position: Royal Horticultural Society. A small plant already calls for a big decision: De Bolster, Royal Horticultural Society. The root zone still matters beneath full foliage: University of Minnesota Extension. Include protection in your garden round: Royal Horticultural Society, University of Minnesota Extension. Harvest leaves and leave room for what follows: University of Minnesota Extension, University of Maryland Extension. A winter bed needs continued observation: Handboek Schooltuinen, via Velt, University of Minnesota Extension. Match sowing to the harvest aim: Royal Horticultural Society, University of Minnesota Extension, De Bolster. For holes, look beneath the leaves too: Royal Horticultural Society, University of Minnesota Extension, De Bolster.