Gardeners Guide · Grow your own
Swiss chard is one of the most underrated vegetables for an autumn and winter garden.
It’s easy to grow, productive, attractive and much tougher than its colourful stems might suggest.
Established plants can continue producing leaves through autumn and, in milder parts of the UK, well into winter. In colder areas, growth may slow or stop during the darkest months, but healthy plants can survive and start producing fresh leaves again as spring approaches.
Give them a little protection with fleece or a cloche during particularly cold weather and you can extend the season even further.
Here’s how to grow Swiss chard successfully through autumn and winter in the UK.
Swiss Chard at a Glance
| Swiss Chard | |
|---|---|
| Main sowing period | March–July |
| Late sowing | July–August |
| Harvest | Summer–spring |
| Difficulty | Easy |
| Position | Sun or partial shade |
| Plant spacing | Around 30cm |
| Containers | Yes |
| Frost hardy | Moderately hardy |
| Harvest method | Pick individual outer leaves |
| Main winter problems | Severe frost, waterlogging and slugs |
What Is Swiss Chard?
Swiss chard is a leafy vegetable closely related to beetroot.
Unlike beetroot, however, it’s grown for its:
leaves and stems rather than its roots.
Depending on the variety, the stems can be:
- White
- Yellow
- Orange
- Pink
- Red
Some mixtures produce several colours on the same vegetable bed.
This makes Swiss chard one of the few vegetables that’s useful both as:
food and an ornamental plant.
Why Grow Swiss Chard Through Winter?
Swiss chard has a very long harvesting season.
A single sowing can potentially provide leaves for months.
Unlike lettuce, you don’t need to harvest the entire plant.
Simply remove the larger outer leaves and allow the centre to continue growing.
Established plants can tolerate:
- Cool autumn weather
- Light frost
- Short winter days
- Partial shade
In mild winters, harvesting may continue for much of the season.
In colder weather, the plant often slows down before producing another flush of growth in spring.
When Should You Sow Swiss Chard for Winter?
For established plants capable of standing through winter, sow during:
spring and early summer.
If you specifically want younger plants for autumn and overwintering, make another sowing around:
July or early August.
Don’t leave it too late.
A seed sown in November isn’t going to produce a large winter plant outdoors.
The aim is to have:
healthy, established plants before cold weather arrives.
Choosing Swiss Chard Varieties
There are several excellent varieties.
Bright Lights
Probably the most recognisable.
It produces stems in a mixture of colours including:
- Red
- Yellow
- Orange
- Pink
- White
Good for: Attractive vegetable beds and containers.
Fordhook Giant
Produces large leaves with broad white stems.
It’s vigorous and productive.
Good for: Large harvests.
Rhubarb Chard
Produces attractive red stems and dark green leaves.
Good for: Ornamental vegetable gardens.
For winter growing, check the seed packet for information about cold tolerance and overwintering.
Where to Grow Swiss Chard
Swiss chard grows well in:
sun or partial shade.
This makes it particularly useful for gardens where not every vegetable bed receives full sun.
During winter, however, give it as much light as possible.
Avoid deeply shaded areas because winter daylight is already limited.
Preparing the Soil
Swiss chard prefers:
fertile, moisture-retentive but well-drained soil.
Before sowing or planting:
- Remove weeds.
- Loosen compacted soil.
- Add well-rotted compost if necessary.
- Rake the surface level.
Good drainage becomes especially important during winter.
Chard can cope with cold better than it can cope with sitting in permanently saturated soil.
How to Sow Swiss Chard
Swiss chard can be sown directly outdoors.
Sow seeds approximately:
2cm deep.
Space them initially around:
10cm apart.
Once seedlings become established, thin them to their final spacing.
The seedlings you remove don’t have to be wasted.
Young chard leaves are edible.
How Far Apart Should Swiss Chard Be?
For full-sized plants, aim for approximately:
30cm between plants.
Larger varieties may benefit from slightly more space.
For baby leaves, plants can be grown much closer together.
Giving mature plants enough room improves airflow and produces larger leaves.
Growing Swiss Chard in Containers
Swiss chard is excellent for container growing.
Choose a reasonably deep container with:
good drainage holes.
For mature plants, allow plenty of space.
A large pot containing two or three colourful chard plants can look surprisingly ornamental.
Containers are also useful during winter because they can be moved to a more sheltered position during severe weather.
Growing Swiss Chard in Raised Beds
Raised beds are ideal for chard.
They provide:
- Good drainage
- Fertile soil
- Easier harvesting
- Easier weed control
They’re particularly useful in gardens with heavy soil that becomes waterlogged during winter.
Growing Swiss Chard Under Cover
You don’t necessarily need a greenhouse.
Established chard can grow outside.
However, protection can extend the harvesting season considerably.
Useful options include:
- Garden cloches
- Horticultural fleece
- Cold frames
- Unheated greenhouses
Even a small amount of protection can help leaves survive periods of harsher weather.
Does Swiss Chard Survive Frost?
Established Swiss chard can tolerate:
light to moderate frost.
Severe or prolonged freezing can damage the leaves.
Don’t immediately assume the entire plant is dead if the foliage collapses after frost.
The roots and central growing point may still be alive.
Remove badly damaged leaves and wait.
The plant may produce new growth when conditions improve.
Protecting Swiss Chard from Frost
When particularly cold weather is forecast, cover outdoor plants with:
horticultural fleece.
Ideally, support the fleece with hoops.
A cloche provides even better protection.
Container-grown plants can be moved:
- Against a sheltered wall
- Into a greenhouse
- Into a cold frame
You don’t need to bring them into a heated house.
What Happens During Midwinter?
Growth can become extremely slow during:
December and January.
This is normal.
The combination of:
- Cold temperatures
- Short days
- Low light levels
means the plant simply can’t produce leaves at summer speed.
During particularly cold periods, it may stop growing altogether.
The objective becomes:
keeping the plant alive until conditions improve.
Watering Swiss Chard During Winter
Outdoor plants usually need very little additional water during winter.
Natural rainfall is often sufficient.
Plants growing under:
- Cloches
- Greenhouses
- Cold frames
need checking because they’re protected from rain.
Water only when necessary.
Cold, permanently wet compost encourages root problems.
Water in the Morning
If you need to water during cold weather, do it earlier in the day.
This gives excess moisture time to drain or evaporate before temperatures fall overnight.
Try to water the soil rather than soaking the leaves.
Feeding Swiss Chard
Swiss chard is a leafy vegetable and appreciates fertile soil.
If your bed was prepared with good-quality organic matter, additional feeding during winter may not be necessary.
Growth slows naturally.
Don’t try to force winter growth with excessive fertiliser.
When stronger growth resumes in spring, a suitable general-purpose vegetable feed can be useful if the soil is poor.
Keep Plants Weed-Free
Remove weeds regularly.
Although mature Swiss chard competes reasonably well, weeds still take:
- Water
- Nutrients
- Light
Keep the base of the plants reasonably clear.
How to Harvest Swiss Chard
Swiss chard is perfect for:
cut-and-come-again harvesting.
Take the larger outer leaves first.
Cut them close to the base.
Leave the smaller central leaves intact.
The plant continues producing new growth from the centre.
Don’t Harvest the Whole Plant
Unless you’re clearing the crop, there’s no reason to remove the entire plant.
Harvesting individual leaves gives you:
a much longer cropping period.
A healthy chard plant can potentially provide dozens of harvests over its lifetime.
How Much Should You Harvest in Winter?
Be conservative.
During summer, chard replaces leaves quickly.
During winter, it doesn’t.
Take:
a few leaves at a time.
Leave plenty of healthy foliage behind.
This helps the plant survive until stronger growth resumes.
Can You Eat Swiss Chard Stems?
Yes.
Both the:
leaves and stems are edible.
The stems take longer to cook than the leaves.
For large leaves, separate them.
Cook the chopped stems first, then add the leaves later.
Young leaves and stems can be cooked together.
When Will Overwintered Chard Start Growing Again?
You’ll usually notice stronger growth during:
late winter and early spring.
Increasing daylight triggers fresh leaves.
This can provide a valuable harvest before newly sown spring vegetables are ready.
What Happens in Spring?
Overwintered Swiss chard often produces an excellent flush of fresh growth.
Eventually, older plants may begin:
bolting.
A flower stalk develops and leaf quality declines.
At this stage, harvest the remaining good leaves and remove the plant.
Then sow a fresh crop for the new season.
Slugs and Snails
Young Swiss chard is particularly attractive to:
- Slugs
- Snails
Mild, damp autumn weather can make them a significant problem.
Check plants regularly.
Established plants can tolerate some leaf damage, but small seedlings can be destroyed.
Leaf Miner
Leaf miners can create pale tunnels or blotches inside chard leaves.
Remove badly affected leaves.
Fine insect mesh can reduce problems by preventing adult insects from reaching the crop.
Minor damage is often mainly cosmetic.
Birds
Birds aren’t usually as destructive to Swiss chard as they are to kale or cabbage.
However, young plants can occasionally be damaged.
If birds become a problem, temporary netting can help.
Why Are My Swiss Chard Leaves Turning Yellow?
Possible causes include:
- Waterlogging
- Nutrient deficiency
- Old leaves
- Frost damage
- Root problems
A few older outer leaves turning yellow is normal.
Remove them and inspect the rest of the plant.
Why Has My Swiss Chard Collapsed After Frost?
The leaves may have been damaged by freezing.
Wait until temperatures improve before assuming the plant is dead.
Remove badly damaged foliage.
If the crown and roots remain healthy, the plant can recover.
Why Isn’t My Swiss Chard Growing?
If it’s the middle of winter:
probably because it’s cold and dark.
Slow growth doesn’t necessarily mean there’s a problem.
If the plant looks healthy, maintain it and wait for longer days.
Why Is My Swiss Chard Flowering?
Your plant is:
bolting.
This commonly happens to overwintered plants as temperatures and daylight increase in spring.
Once flowering begins, leaf quality eventually declines.
Replace older plants with a fresh sowing.
Can Swiss Chard Grow in Scotland?
Yes.
Swiss chard grows very well in Scotland.
For winter harvesting, choose a sheltered position and use fleece, a cloche or an unheated greenhouse during severe weather.
In colder locations, think of winter chard primarily as:
an overwintering crop
rather than expecting constant harvesting throughout December and January.
Can You Grow Swiss Chard in a Greenhouse?
Yes.
An unheated greenhouse can significantly extend the season.
Chard doesn’t require tropical temperatures.
The greenhouse simply protects it from:
- Severe frost
- Strong wind
- Heavy rain
- Snow
Smaller plants can also be grown in pots inside the greenhouse.
Successional Sowing
For a longer harvesting season, don’t rely on one sowing.
Try:
a spring sowing and a midsummer sowing.
The spring crop provides summer and autumn leaves.
The later crop can carry you through autumn and potentially overwinter.
This gives you fresh chard for much more of the year.
What to Grow After Swiss Chard
Once overwintered plants begin flowering in spring, remove them.
The space can then be used for summer crops such as:
- French beans
- Courgettes
- Lettuce
- Peas
- Onions
Add fresh compost if necessary before replanting.
Swiss Chard Through Autumn and Winter
| Period | What to do |
|---|---|
| July | Make a late sowing for autumn |
| August | Thin seedlings and keep watered |
| September | Harvest regularly |
| October | Continue harvesting and prepare protection |
| November | Protect during severe frost |
| December | Harvest lightly |
| January | Maintain plants and expect slow growth |
| February | Watch for new growth |
| March | Harvest fresh spring leaves |
| April | Continue harvesting and watch for bolting |
| May | Replace older plants with new-season crops |
What You’ll Need
Swiss chard doesn’t require much specialist equipment.
I’d recommend:
Swiss chard seeds
Hand trowel
Well-rotted compost
Watering can
For extending the winter harvest:
Horticultural fleece
Garden cloche
Cold frame
Raised bed
These products can also be used for many other winter vegetables, making them useful additions to a productive garden
Swiss Chard FAQs
Can Swiss chard grow through winter in the UK?
Yes. Established plants can survive winter, although growth slows significantly during cold and dark conditions.
When should I sow Swiss chard for winter?
Make a late sowing around July or early August so plants have time to establish before winter.
Can Swiss chard survive frost?
Established plants can tolerate light to moderate frost. Severe frost may damage the leaves.
Should I cover Swiss chard in winter?
It’s not always necessary, but fleece or a cloche can extend the harvesting season and protect plants during severe weather.
Can Swiss chard grow in pots?
Yes. It’s an excellent container vegetable and can also be very ornamental.
Can you eat Swiss chard stems?
Yes. Both the stems and leaves are edible.
How do you harvest Swiss chard?
Cut the larger outer leaves close to the base and leave the centre growing.
Why has my chard stopped growing?
Cold temperatures and short winter days naturally slow growth.
Will Swiss chard grow again in spring?
Yes. Healthy overwintered plants often produce a strong flush of new leaves as temperatures and daylight increase.
Can Swiss chard grow in Scotland?
Yes. It grows well in Scotland, although some winter protection can be useful during severe weather.
Final Thoughts
Swiss chard deserves far more attention as a winter vegetable.
It’s easy to grow.
It doesn’t need much space.
You can eat both the leaves and stems.
And unlike many vegetables, you don’t have to harvest the whole plant.
Pick a few outer leaves and leave the centre growing.
For the best autumn and winter crop, establish plants before cold weather arrives.
Then concentrate on:
good drainage, sensible harvesting and protection during severe frost.
Don’t worry if growth almost stops during December and January.
That’s normal.
Keep the plant healthy and it can reward you with another flush of fresh leaves as spring approaches.
For gardeners trying to produce food throughout more of the year, Swiss chard is an excellent bridge between the summer vegetable garden and the first crops of the following spring.
And if you choose a colourful variety such as Bright Lights, it’ll make the winter vegetable patch look considerably better while it’s doing it.
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