How to Grow Swiss Chard | Soil, pH & Growing Guide

Swiss chard (Beta vulgaris subsp. cicla)

A garden bed of chard plants in mixed leaf colours, green, purple and red — "Beta vulgaris subsp. vulgaris (Swiss chard)" by James Steakley is licensed under CC BY-SA 4.0. Source: Wikimedia Commons

5 sources cited · Verified

The short answer

Ready in: 50–70 days
Site: 4+ hours of sun, soil pH 6–6.5
Biggest risk: Grey mould

In the UK, chard are ready to harvest 50–70 days after planting.

Chard (Beta vulgaris subsp. cicla) — biennial (requires two growing seasons, but treated as an annual).

Core growing advice on this page is checked against named horticultural and university-extension sources — see References.

Soil & Growing Conditions

Water: RHS: water "regularly until well established", then "water during long dry spells"; container plants need "regular watering throughout their growing period". Chard "doesn't usually need feeding". Univ. of Maryland: "Keep plants uniformly supplied with moisture for best performance. Water deeply and regularly during dry periods".

Soil pH range

6 6.5

Span reflects genuine variation between the cited authorities, not a single agreed figure.

Quick Facts

Factor	Value
Soil pH	6 - 6.5
Sunlight	4-8 hours direct sun
Germination temp	12.8C
Optimal growing temp	15-25C
Minimum survivable temp	5C
Time to harvest	50-70 days
Soil texture	RHS: "rich, moisture-retentive, free-draining soil".
Drainage	RHS: free-draining yet moisture-retentive; grow in "full sun, or with some light shade in summer".
Lifecycle	biennial (requires two growing seasons, but treated as an annual)
Edible parts	leaves, thick stems

At a Glance

Growth Stages

Stage	BBCH	Notes
Sowing & germination	0	Sow 2.5cm deep, large seeds spaced 10cm apart, rows 45cm apart. RHS.
Thinning & establishment	3	Thin seedlings to 30cm apart, or 5cm apart if growing for a mini-leaf crop. RHS.
Cropping (cut-and-come-again)	5	Pick outer leaves cleanly at the base to encourage regrowth, or strip all the leaves from an established plant and let it recover before picking again. A spring sowing gives repeated harvests right through summer. RHS.
Overwintering / bolting	6	Chard is hardy and survives winter outdoors without protection, though growth stops in the cold; a July sowing carries leaves through to the following spring. In hot weather plants may bolt -- removing flower stems as they form extends the harvest, though flowering eventually happens regardless. RHS.

Harvest & Storage

When to pick: RHS: pick leaves once "at least 30cm (1ft) tall", or young leaves "up to about 5cm (2in) long" for salads. RHS gives no time from sowing to harvest and no storage method. Univ. of Maryland: "Young leaves (smaller than 4 inches) may be eaten fresh in salads", or harvest "after maturity when they are larger and have slightly tougher stems".

Storage

Univ. of Maryland: "Store in very cold (32 degrees F), moist (95% relative humidity) environment. Store in the refrigerator in a vented mesh or plastic bag". RHS states no storage method.

Diseases

Fuzzy grey-brown Botrytis mould covering a tomato stem — Rasbak, CC BY-SA 3.0 — Rasbak, CC BY-SA 3.0

Grey mould

Botrytis cinerea

Soft brown fruit decay; Fuzzy grey-brown mould

RHS chard guide names grey mould among chard diseases.

Downy mildew (general)

The RHS chard guide names "Downy mildews" among chard diseases.

Pests

Slugs

Gastropoda (slugs, various spp.)

RHS chard guide lists slugs and snails among chard pests.

Snails

Gastropoda (snails, various spp.)

RHS chard guide lists slugs and snails among chard pests.

Beet leaf miner

Pegomya hyoscyami

RHS names Swiss chard explicitly among beet leaf miner hosts; the RHS chard guide also lists beet leaf miner among its pests.

Chard, Bed to Bunch

A bed of mixed colours

Rainbow chard grows the same as plain green or white-stemmed types -- the colour is purely cosmetic. Growing a mixed-colour variety gives the same cut-and-come-again crop with more visual interest in the bed and on the plate.

Chard leaves with red stems and midribs, covered in morning dew — "Starr-090801-3523-Beta vulgaris subsp cicla-habit in garden-Olinda-Maui (24343983673)" by Forest and Kim Starr is licensed under CC BY 3.0 us. Source: Wikimedia Commons — “Starr-090801-3523-Beta vulgaris subsp cicla-habit in garden-Olinda-Maui (24343983673)” by Forest and Kim Starr is licensed under CC BY 3.0 us. Source: Wikimedia Commons.

Established leaves, ready to pick

Outer leaves reach a good picking size while the plant keeps producing new growth from the centre. Cut outer leaves cleanly at the base rather than tearing them, which damages the crown and slows regrowth.

Close-up of rainbow chard leaf stems in vivid orange and yellow — "Münster, Botanischer Garten, Mangold -- 2019 -- 7371" by Dietmar Rabich is licensed under CC BY-SA 4.0. Source: Wikimedia Commons — “Münster, Botanischer Garten, Mangold -- 2019 -- 7371” by Dietmar Rabich is licensed under CC BY-SA 4.0. Source: Wikimedia Commons.

The stems are the other half of the crop

Chard stems are edible too and often cooked separately from the leaves, since they take longer to soften. The bright colour runs right through the stem, not just the surface.

Backlit chard leaf showing deep red veins against green leaf tissue — "Blätter vom Roten Mangold (Chard)" by August Geyler is licensed under CC BY-SA 4.0. Source: Wikimedia Commons — “Blätter vom Roten Mangold (Chard)” by August Geyler is licensed under CC BY-SA 4.0. Source: Wikimedia Commons.

Reading the leaf

A healthy chard leaf is glossy and firm with clearly defined veins running to the leaf edge. Backlighting like this shows the vein structure clearly -- useful for spotting early leaf-spot damage, which shows as small circular lesions between the veins rather than following them.

A harvested bunch of rainbow chard with red, orange, yellow and white stems tied together — "Rainbow chard for sale at the Campbell farmers market" by Grendelkhan is licensed under CC BY-SA 4.0. Source: Wikimedia Commons — “Rainbow chard for sale at the Campbell farmers market” by Grendelkhan is licensed under CC BY-SA 4.0. Source: Wikimedia Commons.

A bunch ready for the kitchen

Because chard keeps producing over months rather than cropping all at once, most harvests are a handful of leaves at a time rather than a bunch this size -- worth remembering when deciding how much to sow.

References

FAO EcoCrop - Beta vulgaris var. cicla data sheet

country=INTL
Royal Horticultural Society - Beet leaf miner

country=UK
Royal Horticultural Society - How to grow Chard | RHS Guide

country=UK
University of Maryland Extension - Growing Swiss Chard in a Home Garden

country=USA
Utah State University Extension - How to Grow Swiss Chard in Your Garden

country=USA

5 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

How long do chard take to grow?

Typically 50–70 days, depending on cultivar and growing conditions.

What soil pH do chard need?

A pH of about 6–6.5. 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 chard?

Our data links 2 diseases and 3 pests to this crop. See the sections above for each one and how to manage it.

Plan next season before the problems start

This page gives you the thresholds; the planner turns them into your own calendar. It works from what you can observe and measure in your garden rather than from dates written for somebody else’s latitude.

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SoilCommander Editorial Team

Science-based growing guides · Thresholds that hold in any climate

This guide states the conditions the plant itself responds to — soil temperature, frost tolerance, day length — rather than dates, because the same calendar month means opposite seasons in the northern and southern hemispheres. Anything genuinely restricted to one part of the world is named as such rather than presented as universal. Written and maintained by our editorial team against international horticultural research and extension sources.

Vegetable Growing Guides

Last verified 2026-08-06

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How to Grow Swiss Chard | Soil, pH & Growing Guide

Swiss chard (Beta vulgaris subsp. cicla)

Soil & Growing Conditions

Quick Facts

At a Glance

Growth Stages

Harvest & Storage

Diseases

Pests

Chard, Bed to Bunch

References

Frequently Asked Questions

Where To Go From Here

Plan the next step

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How to Grow Swiss Chard | Soil, pH & Growing Guide

Swiss chard (Beta vulgaris subsp. cicla)

Soil & Growing Conditions

Quick Facts

At a Glance

Growth Stages

Harvest & Storage

Diseases

Pests

Chard, Bed to Bunch

References

Frequently Asked Questions

Where To Go From Here

Plan your veg garden before you dig a single inch

Plan the next step