Pelham GardensGrow What Matters

Swiss Chard

Colourful, cut-and-come-again leaves with striking stems. One of the most reliable crops for a long harvest.

Written by Yemi · Last reviewed August 2026

Maturing this month
First sprouts in 10–14 days

Difficulty

Swiss Chard

Swiss Chard should be ready to harvest this month. Check for size and colour.

Growing Calendar

Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Sow
Transplant
Harvest

This month: Sep

Log to journal

Ready to harvest now

  • Check size and ripeness
  • Harvest regularly
  • Store or use fresh

Sowing Guide

What you'd find on the seed packet

Sow Depth

2.5cm

Spacing

30cm

Germination

10–14days

Thinning

Thin to 30cm apart when seedlings reach 5cm tall

Grower's Note

Each 'seed' is a cluster: thin promptly. Can be grown in containers with a minimum 30cm depth.

Recommended Varieties

'Bright Lights' holds an RHS Award of Garden Merit and gives you red, yellow and pink stems with genuinely good winter hardiness. 'Fordhook Giant' also holds an AGM: the long-standing standard green variety, bred for vigour and notably slower to bolt in summer heat than most leafy crops.

Planting Out Guide

Best spaces, conditions and how to plant out

Plant Spacing

30cm

Best Grown In

Raised beds, large containers, open ground

Conditions

Sun or partial shade. Fertile, moisture-retentive soil. Tolerates light frost.

Grower's Note

Cut-and-come-again: harvest outer leaves regularly and the plant will keep producing. One of the most productive crops per square foot.

Growing Stages

Approximate weeks from sowing to harvest

Sprouting

1wks

Seeds germinate and first leaves emerge. Keep warm and moist.

Establishing

3wks

Root system develops and plant builds structure. Pot on if needed.

Maturing

6wks

Plant reaches full size and begins producing. Harvest at peak.

Total~10 weeksfrom seed to harvest

Climate Control

Today

C

Humidity

%

Water

Every 2–3 days

Sunlight

3–6 hours sun

Watch Out For

Slugs target young plants heavily: protect with grit or copper tape and transplant once plants are sturdy enough to recover from minor damage

Bolts quickly in prolonged heat or drought: water consistently during dry spells and choose bolt-resistant varieties for summer sowings

Powdery mildew in dry conditions: water at the base, avoid wetting the leaves and improve airflow between plants

Pests & Problems

Full guide

Leaf Miner

Pale blotchy tunnels within leaves

May–Sep

Aphids

Small colonies on leaf undersides

May–Aug

Slugs

Holes in young leaves

Mar–Oct

What You'll Need

Equipment for growing swiss chard

Modular Seed Tray

96-cell for precision sowing

Fine Rose Watering Can

Gentle shower for seedlings

Bamboo Canes

Pack of 20 × 120cm

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Grown Organically

Every method in this guide works with natural systems: no synthetic chemicals, no shortcuts.

Read our approach

Common Questions

About growing Swiss Chard in the UK

When do I sow Swiss chard in the UK?

Sow Swiss chard from April to July. It grows quickly and can be harvested within 8–10 weeks of sowing. Autumn sowings (late August) will produce through winter under a cloche.

Can I grow Swiss chard in shade?

Swiss chard tolerates partial shade better than most vegetables, making it a good choice for less sunny spots. Full sun gives the fastest growth, but 3–4 hours of direct sun per day is sufficient.

Is Swiss chard the same as spinach?

No, they are different plants. Swiss chard has thick, colourful stems and large, crinkled leaves. It is generally easier to grow, more productive, and far less likely to bolt than true spinach.

How do I harvest Swiss chard?

Harvest outer leaves from the base once plants are 20–25cm tall, leaving the central growing point and younger leaves intact. Plants will continue producing for months. One plant can provide harvests for an entire season.

Written from real growing experience, not just research. Read the story behind Pelham Gardens.

Member guides

There's more to growing Swiss Chard than this guide covers.

A Garden Journal to log what worked, a personalised sowing planner in My Garden, and monthly reminders timed to the calendar.

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