Vegetable · Amaranthaceae
Swiss Chard
Beta vulgaris subsp. vulgaris
Plant it once for leaves all season, cut the outer stalks, and Swiss chard keeps coming back.
Full sun
Every 3–7 days
41–86°F · 5–30°C
50–60 days
Overview
Swiss chard is a leafy green grown for its broad, glossy leaves and thick, edible stalks. It's the same species as the beet, bred for tops instead of roots, and it belongs to the same family as spinach. The plant is a biennial grown as an annual, putting all its energy into leaves the first season before it would ever flower.
What sets chard apart is how forgiving it is. It shrugs off both summer heat and light frost better than most greens, which is why a single spring planting can feed you well into fall. The colorful types turn the vegetable bed into something worth looking at, with stalks in red, pink, yellow, and white glowing against dark leaves.
It's also one of the easiest crops for a beginner. Sow the seed, keep the soil moist, and start cutting the outer leaves while the center keeps making more. Give it steady water and decent soil and chard asks for very little in return.
Care
The short version: full sun to a bit of afternoon shade, rich and evenly moist soil, and regular harvesting of the outer leaves to keep tender new growth coming.
Light
Chard grows best in full sun but takes partial shade in stride, which actually helps in hot weather by slowing the rush to bolt. In deep shade the leaves come in thin and the plant slows right down.
Water
Keep the soil evenly moist, about 1 to 1.5 inches of water a week. Steady moisture is what keeps the leaves tender and holds off the bolting that heat and dry spells bring on.
Soil
Plant in rich, well-drained loam loaded with organic matter. A pH of 6.0 to 7.0 suits it, and digging in compost before sowing pays off all season.
Temperature
Chard handles a wide range, growing from about 41°F to 86°F (5°C to 30°C). It takes a light frost without flinching and keeps going through summer heat better than most greens.
Humidity
Ordinary outdoor air is fine, with 40% to 70% humidity well within its comfort. Good airflow matters more than any exact number, since crowded, damp leaves invite leaf spot.
Feeding
Side-dress with a balanced, nitrogen-containing vegetable fertilizer during active leaf growth, starting in spring. Because you're harvesting leaves all season, a steady supply of nitrogen keeps new ones coming.
Pruning
Harvest is the pruning here. Cut the outer leaves at 4 to 12 inches near the base and leave the central crown alone, and the plant keeps pushing fresh growth cut-and-come-again.
Repotting
Chard is grown as an annual, so there's no repotting to do. Reseed containers each season rather than trying to carry a plant over, and pot up to a roomy planter so the roots aren't cramped.
Size & spacing
Plants reach 12 to 24 inches (30 to 60 cm) tall with an 8 to 18 inch (20 to 45 cm) spread. Thin seedlings to 4 to 6 inches apart so each one has room and air can move between them.
When to plant
Swiss chard is a cool-season grower that takes both spring chill and summer heat. Start seed indoors in late winter or sow straight into the ground a couple of weeks before the last frost, then sow again in late summer for a crop that carries through fall.
Northern hemisphere
Southern hemisphere
Typical months for a temperate climate: start earlier in warm zones, later where spring frosts linger.
- Sow: 4 to 6 weeks before the last spring frost
- Plant: 2 to 3 weeks before the last spring frost, and again in late summer for a fall crop
- Harvest: Harvest leaves from early summer through fall (and over winter in mild climates)
Hardiness
USDA hardiness zones: 3–10
Temperature: down to -40°C
Troubleshooting
Chard rarely gives much trouble, and most of what does show up lands on the leaves. Catch the early signs and you can pick off the problem before it spreads. Match what you see below, then act while it still helps.
Small tan spots ringed with darker borders
This is Cercospora leaf spot, a fungus that shows up as round spots with purplish margins that run together as it spreads. Cut off and destroy the spotted leaves, then keep harvesting the clean outer ones. Thinning the planting so air moves freely is what really slows it down.
Fix:
- Remove and destroy infected leaves
- Harvest healthy outer leaves
- Improve air circulation by thinning
A tall flower stalk shoots up and the leaves turn bitter
Bolting is the plant switching from leaves to seed, set off by a long hot spell or, sometimes, a cold snap early in its life. Once a central seed stalk shoots up, leaf growth stalls and the flavor sours. Harvest what's still good before it turns, then pull the bolted plant and sow a fresh round.
Fix:
- Harvest remaining leaves before they turn bitter
- Pull bolted plants and resow for a fresh crop
Pale winding tunnels traced through the leaves
Those squiggly trails are the work of leafminer larvae feeding between the upper and lower leaf surfaces. Hold a leaf to the light and you can often spot the grub or its dark frass inside the mine. Pick off and destroy the marked leaves as soon as you see them, and a healthy plant simply grows past the loss.
Fix:
- Pick off and destroy mined leaves promptly
- Remove larvae by hand
- Keep plants vigorous so outer leaves can be sacrificed
Toxicity
Swiss chard is a wholesome green for people, eaten cooked or raw, with no poisons to worry about. It is high in soluble oxalates, though, which is a mild caution for cats, dogs, horses, and grazing animals if they eat a lot of it over time. A taste does no harm, but it shouldn't become a regular part of any animal's diet.
Toxic to
Cats · Dogs · Horses · Rabbits · Livestock · Birds
Safe for
People
Cats Caution
Chard isn't poisonous to cats, but the leaves carry a lot of soluble oxalates. A nibble does no harm, while a big helping eaten often can irritate the gut and, over time, strain the kidneys.
Dogs Caution
A few leaves won't hurt a dog. Keep the portions small, though, since the high oxalate load can upset the stomach and, in large amounts, work against the kidneys.
Horses Caution
Small tastes are fine for horses, but chard packs more oxalate than is ideal. Steady, heavy grazing can throw off how the body handles calcium and tax the kidneys.
Rabbits Caution
Rabbits can have chard as part of a mixed leafy diet, yet it shouldn't be a daily staple. The oxalates add up, so rotate it with lower-oxalate greens rather than feeding it alone.
Livestock Caution
Goats, sheep, and cattle handle a little chard without trouble. Large quantities of the oxalate-rich leaves over time can interfere with calcium and put pressure on the kidneys.
Birds Caution
Backyard hens and pet birds can peck at chard now and then. Because of the oxalates it's an occasional treat, not a regular ration.
People Edible
Swiss chard is a nutritious kitchen green, cooked or raw, and safe to eat. The one thing to know is its high oxalate content, which matters mainly for anyone prone to kidney stones.
No special handling precautions are required; rinse leaves before eating.
Helpline numbers
United States
ASPCA Animal Poison Control: (888) 426-4435 (fee applies)
United Kingdom
Animal PoisonLine: 01202 509000 (fee applies)
Australia
Animal Poisons Helpline: 1300 869 738
Varieties
Most chard varieties differ mainly in the color of their stalks and the texture of their leaves. These are the ones you'll run across most often.
Bright Lights
An All-America Selections winner whose stalks and midribs come in a mix of red, pink, yellow, orange, and white.
Northern Lights
Carries the same vivid coloring in its stalks and midribs, running through red, pink, yellow, and white.
Ruby (Rhubarb) Chard
Sets deep red stalks and veins against dark green, heavily savoyed leaves for a bold look in the bed.
Fordhook Giant
A vigorous heirloom with broad white stalks and large, dark green, crumpled leaves.
Companions
Chard does well alongside other cool-season leafy crops and a few common garden neighbors, and poorly next to beans, which don't share well with it or its beet relatives.
Plant near
Cabbage family (brassicas): Listed as compatible neighbors that share cool-season conditions in extension companion guidance.
Lettuce: Compatible low-competition leafy crop grown in the same cool-season beds.
Tomatoes: Listed as a beneficial companion for chard in extension companion planting guidance.
Keep apart
Beans: Beans are listed as an incompatible companion for chard and beets in extension companion planting guidance.
How to propagate
Swiss chard is grown from seed, and that's all you need. There's a small quirk to the seed worth knowing before you sow.
SeedEasy
Spring and again in late summer for a fall crop · 50 to 60 days from sowing to first full harvest
Chard grows easily from seed sown in spring and again in late summer for a fall crop. Each 'seed' is really a multigerm ball, a dried fruit cluster that throws up several seedlings at once, so thin them to 4 to 6 inches apart once they're up. From sowing to a first full harvest runs about 50 to 60 days.
Myths
Swiss chard must be replanted every few weeks like spinach to keep it from bolting.
Chard takes both heat and cold in stride and resists bolting far better than spinach. One planting can feed you cut-and-come-again across a long season, so there's no need for the rolling sowings spinach demands.