Red cabbage microgreens are fast-growing brassica seedlings with deep purple stems, dark green to purple-toned leaves and a mild, slightly sweet cabbage flavour. They are easy to grow in shallow trays and are commonly ready to harvest approximately 7–10 days after sowing.
If you are learning how to grow Red Cabbage microgreens, they are an excellent variety for beginners. The seeds do not normally require soaking and can be grown using soil, coco coir, seed-raising mix, hemp growing mats or another suitable microgreen growing medium.
This step-by-step guide covers everything you need to grow Red Cabbage microgreens successfully, including sowing rate, germination, covered growing, watering, light, temperature, harvesting and common growing problems.
Red Cabbage Microgreens at a Glance
What Are Red Cabbage Microgreens?
Red Cabbage microgreens are the young seedlings of red cabbage, Brassica oleracea var. capitata. They belong to the Brassicaceae family alongside broccoli, kale, cauliflower, mustard, Mizuna and Tatsoi.
Unlike mature cabbage, which is grown for many weeks until it develops a dense head of leaves, microgreens are harvested at a very young stage. The crop is normally cut once the cotyledons are fully developed and before significant true-leaf growth.
Red Cabbage is especially distinctive as a microgreen because of its purple to reddish stems and contrasting green-purple foliage. This makes it useful for adding colour to mixed microgreen trays, salads and garnishes.
What Do Red Cabbage Microgreens Taste Like?
Red Cabbage microgreens have a mild, fresh and slightly sweet brassica flavour.
They are generally less peppery than radish and substantially milder than strongly flavoured mustard microgreens.
The flavour is similar to young cabbage but more delicate, which makes Red Cabbage easy to combine with other microgreens.
They can be used in:
- Salads
- Sandwiches
- Wraps
- Burgers
- Grain bowls
- Cold noodle dishes
- Garnishes
- Mixed microgreen trays
Why Grow Red Cabbage Microgreens?
- Fast-growing crop, commonly ready in approximately 7–10 days.
- Attractive purple stems and contrasting foliage.
- Mild flavour that combines easily with other microgreens.
- No seed pre-soaking required.
- Suitable for growing indoors throughout the year.
- Can be grown in soil, coco coir or on suitable microgreen mats.
- Easy variety for beginners.
- Useful for adding colour to mixed microgreen crops.
- Suitable for home and commercial microgreen production.
Are Red Cabbage Microgreens Easy to Grow?
Yes. Red Cabbage is generally an easy microgreen variety to grow.
The seed does not normally require soaking, germinates relatively quickly and establishes well in standard microgreen growing media.
Like other small-seeded brassicas, the main considerations are maintaining good seed-to-medium contact, avoiding excessive sowing density and keeping the crop moist without waterlogging it.
Good airflow becomes particularly important once the leaves form a dense canopy.
How to Grow Red Cabbage Microgreens in 7 Simple Steps
- Prepare the growing tray. Add approximately 2–4 cm of moist growing medium and level the surface.
- Sow the Red Cabbage seeds. Spread approximately 25 g evenly over a standard 10 × 20 inch tray.
- Mist thoroughly. Moisten the seeds and growing surface without washing the seeds into clumps.
- Cover the tray. Place another tray or suitable cover over the seeds during initial germination.
- Introduce the seedlings to light. Remove the cover once the seedlings are established and pushing upward.
- Water carefully. Bottom water once the roots are established, keeping the medium moist but not saturated.
- Harvest. Cut the Red Cabbage microgreens just above the growing medium at approximately 7–10 days.
What You Need to Grow Red Cabbage Microgreens
- Red Cabbage microgreen seeds
- Shallow growing tray with drainage holes
- Solid bottom watering tray
- Second tray or germination cover
- Soil, coco coir, seed-raising mix or suitable microgreen mat
- Spray mister
- Clean water
- Bright natural light or suitable LED grow light
- Clean scissors or harvesting knife
Do Red Cabbage Microgreen Seeds Need to Be Soaked?
No. Red Cabbage microgreen seeds do not normally need to be soaked before sowing.
The seeds are small and readily absorb moisture when placed onto damp growing media.
Pre-soaking also makes small cabbage seeds more difficult to distribute evenly across a tray.
Sow the seeds dry and mist them well after planting.
How Much Red Cabbage Seed Should You Use per Tray?
Seedmart recommends approximately 25 grams of Red Cabbage seed per standard 10 × 20 inch microgreen tray.
For a 10 × 10 inch tray, approximately 12–13 grams provides an equivalent starting density.
These figures should be treated as practical starting points rather than absolute requirements.
Seeding density can be adjusted according to seed lot, tray dimensions, growing medium, airflow and the harvest stage you prefer.
The goal is to produce an even canopy without creating an excessively dense crop.
Best Growing Medium for Red Cabbage Microgreens
Red Cabbage microgreens grow successfully in several different media.
Seed-Raising Mix or Fine Potting Mix
A quality, fine-textured seed-raising or potting mix is one of the most forgiving options for beginners.
Add approximately 2–4 cm to the tray and gently level the surface.
The medium should be moist before sowing but not saturated.
Coco Coir
Coco coir provides a clean and relatively uniform surface with good moisture retention.
Moisten the coir before sowing and allow excess water to drain.
Hemp Growing Mats
Red Cabbage can also be grown using purpose-made hemp microgreen growing mats.
Fully moisten the mat before sowing and then allow excess water to drain.
During growing, keep the mat consistently moist without leaving it submerged in standing water.
Best Temperature for Red Cabbage Microgreens
A practical indoor growing temperature for Red Cabbage microgreens is approximately 18–24°C.
This range suits many brassica microgreens and helps support steady growth.
Temperatures above approximately 24°C can increase disease pressure, particularly when crops are densely sown and airflow is limited.
In warmer Australian climates, ventilation and careful watering therefore become increasingly important.
Step 1: Prepare the Growing Tray
Start with clean growing trays and equipment.
If using soil, coir or seed-raising mix, add approximately 2–4 cm of medium.
Level the surface gently without heavily compacting it.
Moisten the medium evenly before sowing. It should feel damp throughout but should not contain pools of water.
Step 2: Sow the Red Cabbage Seeds
Spread the seed evenly over the entire growing surface.
For a standard 10 × 20 inch tray, approximately 25 grams provides a useful starting sowing rate.
Take a little time to distribute the seed evenly. Thick clumps can create uneven growth and restrict airflow.
Once sown, gently press the seeds against the growing medium to improve seed-to-medium contact.
Mist thoroughly with clean water.
Step 3: Cover the Tray During Germination
Place another tray or suitable germination cover over the seeds.
The cover helps maintain humidity around the seed and provides darkness during initial germination.
Check the crop regularly and make sure the growing surface remains moist.
Red Cabbage seeds commonly germinate within approximately 2–4 days under suitable conditions.
Do Red Cabbage Microgreens Need Weight?
Red Cabbage microgreens do not normally require heavy weighting.
A second tray can provide light, even pressure during initial germination and helps keep the seeds in close contact with the growing medium.
Heavy weights such as those sometimes used for sunflower or pea microgreens are unnecessary.
How Long Should Red Cabbage Microgreens Stay Covered?
Approximately 2–3 days of covered germination provides a useful starting point.
However, seedling development is more important than following an exact number of days.
Remove the covering tray once most seeds have germinated and the seedlings are established and pushing upward.
Avoid leaving the crop covered substantially longer than necessary, as prolonged darkness can produce weak, elongated stems.
Step 4: Move the Seedlings into Light
After germination, remove the covering tray and place the crop under suitable natural or artificial light.
The seedlings may appear pale immediately after being uncovered. This is normal.
As the plants receive light, the cotyledons open and the characteristic green, purple and reddish colours become more pronounced.
Adequate light also helps keep stems compact and strong.
How Much Light Do Red Cabbage Microgreens Need?
Red Cabbage microgreens require good light after germination.
A bright windowsill can work where light is sufficient, although a dedicated LED grow light provides more consistent results indoors.
Avoid placing trays against very hot glass or in intense afternoon sunlight where temperatures can rise rapidly.
If using artificial lighting, maintain an appropriate distance between the canopy and light source so seedlings receive useful light without excessive heat.
Why Do Red Cabbage Microgreens Turn Purple?
The purple and reddish colouring of Red Cabbage microgreens is associated with naturally occurring plant pigments called anthocyanins.
Research analysing Brassica microgreens has identified numerous cyanidin-based anthocyanins in Red Cabbage microgreens. The amount and appearance of plant pigments can vary according to genetics, light, temperature and growing conditions.
You can read more in this peer-reviewed study on polyphenols and anthocyanins in Brassica microgreens.
The purple colouring is also one of the practical reasons Red Cabbage is popular in mixed microgreen crops: it adds visual contrast without introducing an especially strong flavour.
Step 5: Water Red Cabbage Microgreens Carefully
During germination, mist as required to keep the seed and growing surface evenly moist.
Once roots are well established, bottom watering is generally preferable.
Add water to the solid lower tray and allow the growing medium to absorb moisture through the drainage holes.
Bottom watering helps keep the foliage drier and reduces repeated splashing of the growing medium onto the seedlings.
Avoid:
- Waterlogged growing media
- Standing water beneath the tray for prolonged periods
- Repeatedly soaking the foliage
- Allowing the growing medium to dry completely
Step 6: Allow the Cotyledons to Develop
After exposure to light, Red Cabbage seedlings develop rapidly.
The paired cotyledons expand and the canopy becomes increasingly dense.
Maintain suitable light, moisture and airflow while the crop develops.
At this stage, the stems should become more strongly purple or reddish and the foliage should develop the characteristic colour of the variety.
Step 7: When to Harvest Red Cabbage Microgreens
Red Cabbage microgreens are commonly ready to harvest approximately 7–10 days after sowing.
Harvest timing can be adjusted according to growing conditions and your preferred crop stage.
Look for:
- Fully opened cotyledons
- Strong green-purple leaf colour
- Purple or reddish stems
- Healthy upright growth
- Approximately 5–8 cm of height
- Tender stems and foliage
- Little or early true-leaf development
Some growers allow Red Cabbage to develop until the first true leaf begins to emerge, which can extend the crop into approximately the 10–15 day range.
How to Harvest Red Cabbage Microgreens
Use clean scissors or a sharp harvesting knife.
Cut the stems just above the growing medium, taking care not to include soil, coir or pieces of growing mat.
Where possible, harvest while the foliage is reasonably dry rather than immediately after overhead watering.
Red Cabbage is generally grown as a single-cut microgreen crop. For the next harvest, sow a fresh tray.
How Much Can You Harvest from a Tray?
Yield depends on sowing density, seed germination, light, growing medium, temperature and harvest stage.
Seedmart’s current Red Cabbage microgreen growing information indicates that a 10 × 20 inch tray sown with approximately 25 g of seed can produce up to around 220 g of fresh microgreens under suitable growing conditions.
Actual yield will vary, so this should be regarded as an approximate guide rather than a guaranteed result.
How to Store Red Cabbage Microgreens
For best storage, harvest the crop as dry as reasonably possible.
If the microgreens are wet, allow excess surface moisture to drain before refrigeration.
Store the harvested microgreens in a clean container in the refrigerator.
A small amount of absorbent paper can help manage excess condensation.
As with all fresh produce, discard microgreens showing obvious spoilage, unpleasant odour or mould.
Red Cabbage Microgreens vs Broccoli Microgreens
Red Cabbage and broccoli are both brassica microgreens and have similar basic growing requirements, but they differ in colour, flavour and typical harvest timing.
Red Cabbage Microgreens vs Radish Microgreens
Red Cabbage and radish are both fast-growing brassica microgreens, but they have noticeably different flavours and appearances.
Red Cabbage Microgreens vs Red Cabbage Baby Greens
Red Cabbage microgreens and baby cabbage greens come from the same type of plant but are grown at different densities and harvested at different stages.
Growing Red Cabbage Microgreens in Warm and Humid Weather
Red Cabbage is a cool-season brassica, so warm and humid conditions can make microgreen production more challenging.
In subtropical areas such as Brisbane, the combination of warmth, a dense canopy and moisture can increase the likelihood of mould and damping-off.
During warm or humid weather:
- Maintain good airflow around the trays
- Avoid excessive sowing density
- Bottom water once roots are established
- Avoid continuously saturated growing media
- Do not leave unnecessary standing water beneath trays
- Move germinated seedlings into light promptly
- Avoid very hot windowsills
- Use a small fan where indoor air is stagnant
If you are growing Red Cabbage microgreens through a Brisbane summer, moisture management and airflow are usually more important than trying to keep the crop constantly wet.
Common Problems When Growing Red Cabbage Microgreens
Mould
Mould is more likely where crops are overcrowded, persistently wet or poorly ventilated.
Reduce the risk by using clean trays, maintaining an appropriate sowing density, avoiding waterlogged media and providing good airflow.
Discard visibly mouldy or spoiled microgreens rather than eating them.
White Fuzz Around the Roots
Fine white hairs surrounding healthy young roots are often root hairs rather than mould.
Root hairs generally appear evenly around the roots and can become less visible immediately after misting.
Mould tends to spread more irregularly over the seed, stems or growing medium.
Pale Seedlings After Blackout
Pale or yellow seedlings are normal immediately after dark germination.
Move the crop into suitable light and the foliage should begin developing its normal green and purple colouring.
Poor Purple Colour
Red Cabbage pigmentation is influenced by genetics and growing conditions.
If established seedlings remain unusually pale, check that they are receiving adequate light.
Temperature and cultivar can also affect the exact shade and intensity of the crop.
Leggy Seedlings
Tall, weak stems usually indicate inadequate light or excessive time under the germination cover.
Move established seedlings into suitable light and avoid unnecessarily prolonging blackout.
Seedlings Falling Over
Check for excessive sowing density, insufficient light, overwatering, damping-off or poor airflow.
A very dense crop can become weak as seedlings compete for light and space.
Wilting
If the crop is healthy but wilting, check the growing medium for dryness.
Red Cabbage microgreens can use water quickly as the canopy develops.
If the medium is already very wet, do not automatically add more water. Inspect drainage, roots and stems for signs of disease.
Frequently Asked Questions
How long do Red Cabbage microgreens take to grow?
Red Cabbage microgreens are commonly ready for harvest approximately 7–10 days after sowing. Crops grown to the early true-leaf stage may be harvested somewhat later.
Do Red Cabbage microgreen seeds need to be soaked?
No. Red Cabbage seeds do not normally require pre-soaking before sowing.
How much Red Cabbage seed should I use in a 10 × 20 tray?
Approximately 25 grams provides a useful starting rate for a standard 10 × 20 inch microgreen tray.
How much seed should I use in a 10 × 10 tray?
Approximately 12–13 grams provides an equivalent starting point for a 10 × 10 inch tray.
Do Red Cabbage microgreens need blackout?
A short period of covered or dark germination is useful while the seeds establish. Approximately 2–3 days provides a practical starting point.
Do Red Cabbage microgreens need weight?
Heavy weighting is not normally necessary. A second tray can provide light, even pressure during early germination.
When should I uncover Red Cabbage microgreens?
Uncover the crop once most seeds have germinated and the seedlings are established and pushing upward.
Can Red Cabbage microgreens be grown without soil?
Yes. They can be grown using suitable soilless media such as coco coir or purpose-made hemp microgreen mats.
What temperature is best for Red Cabbage microgreens?
Approximately 18–24°C provides a useful indoor growing range.
Why are my Red Cabbage microgreens yellow?
If they have just been removed from blackout, pale or yellow cotyledons are normal. They should begin developing colour after exposure to suitable light.
Why are Red Cabbage microgreens purple?
The purple-red colour is produced by naturally occurring pigments called anthocyanins. Genetics, light and other environmental conditions influence the final colour.
What do Red Cabbage microgreens taste like?
They have a mild, slightly sweet brassica flavour and are generally much less peppery than mustard or radish microgreens.
When should Red Cabbage microgreens be harvested?
Harvest when the cotyledons are fully developed, colour is well established and the stems are tender. This commonly occurs approximately 7–10 days after sowing.
Can Red Cabbage microgreens be grown indoors?
Yes. They grow well indoors when provided with suitable light, consistent moisture and adequate airflow.
Do Red Cabbage microgreens regrow after cutting?
Red Cabbage is normally treated as a single-cut crop. Sow a new tray for your next harvest.
Final Tips for Growing Red Cabbage Microgreens
Red Cabbage is one of the easier brassica microgreens to grow and is particularly useful when you want to add colour without adding an intensely spicy flavour.
The seeds require no pre-soaking, establish quickly and can commonly be harvested approximately 7–10 days after sowing.
For reliable results, sow evenly, maintain good seed-to-medium contact, keep the growing medium consistently moist without saturating it, uncover the seedlings once established and provide adequate light and airflow.
The result is a colourful crop with tender stems, attractive purple-red colouring and a mild cabbage flavour that works well on its own or mixed with other microgreens.
Ready to grow your own? Shop Red Cabbage Microgreen Seeds from Seedmart Australia.