Vegetable · Amaranthaceae
Swiss Chard
Beta vulgaris subsp. vulgaris
Set it in once, snip the outer stalks, and Swiss chard keeps rewarding you with leaves all season long.
Full sun
Every 3–7 days
41–86°F · 5–30°C
50–60 days
Overview
Swiss chard rewards you with broad, glossy leaves and thick, colorful stalks that are just as good on the plate. It is the very same species as the garden beet, only bred for its leafy tops instead of its roots, and it sits in the same family as spinach. Think of it as a biennial that you grow as an annual, since it pours all its effort into leaves that first season and rarely gets around to flowering.
The best part for anyone just starting out is how kindly chard treats a gardener. It stands up to summer heat and a light frost better than most greens, so a single planting in spring can keep feeding you all the way into fall. If you choose the bright kinds, the bed turns cheerful with stalks in red, pink, yellow, and white shining against deep green leaves.
Few crops are this welcoming to a first try. Tuck the seed in, keep the soil damp, and begin picking the outer leaves while the middle of the plant carries on making more. Offer it steady water and reasonably good soil, and chard gives back far more than it asks, so any early stumble is easy to recover from.
Care
The short version: give it full sun or a touch of afternoon shade, keep the soil rich and evenly moist, and pick the outer leaves often so gentle new growth keeps arriving.
Light
Chard is happiest in full sun, yet it takes partial shade in good humor, and that shade is a real help in hot spells because it slows the plant's rush to bolt. Give it too much deep shade, though, and the leaves come in thin while growth drags.
Water
Aim to keep the soil evenly moist, which works out to roughly 1 to 1.5 inches of water each week. That steady drink is what keeps the leaves tender and gently holds off the bolting that heat and dry stretches can bring on.
Soil
Settle chard into rich, well-drained loam that is generous with organic matter. It feels right at home at a pH of 6.0 to 7.0, and working some compost in before you sow will reward you all season long.
Temperature
Chard is comfortable across a wide span, growing happily from about 41°F to 86°F (5°C to 30°C). A light frost does not faze it, and it keeps right on going through summer heat when other greens would give up.
Humidity
Everyday outdoor air suits chard just fine, and 40% to 70% humidity sits well within its comfort. What really counts is good airflow rather than any exact reading, since leaves left crowded and damp can invite leaf spot.
Feeding
Side-dress with a balanced, nitrogen-containing vegetable fertilizer while the plant is busy growing leaves, beginning in spring. Since you will be harvesting leaves all season, that gentle, steady nitrogen keeps fresh ones coming your way.
Pruning
Here the harvest is the pruning, which makes things easy. Cut the outer leaves at 4 to 12 inches down near the base and leave the central crown untouched, and the plant will happily keep sending up new growth cut-and-come-again.
Repotting
Because chard grows as an annual, there is no repotting to fuss over. Simply reseed your containers each season instead of trying to carry a plant through, and choose a roomy planter so the roots never feel cramped.
Size & spacing
Expect plants to reach 12 to 24 inches (30 to 60 cm) tall with a spread of 8 to 18 inch (20 to 45 cm). Thin the seedlings to 4 to 6 inches apart so each little plant has elbow room and air can drift between them.
When to plant
Chard is a cool-season friend that copes with spring chill and summer warmth alike, so there is plenty of room for a relaxed start. You can begin seed indoors in late winter, or simply sow it into the ground a couple of weeks before the last frost. Come late summer, sow another round and you will have leaves carrying on 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 hardly ever causes worry, and when something does turn up it usually stays on the leaves where you can spot it early. Look it over now and then, catch the first signs, and you can lift off the trouble before it travels. Find your plant's symptom below and act while a small step still makes a difference.
Little tan spots edged in a darker ring
These are the calling card of Cercospora leaf spot, a fungus that appears as round spots rimmed in purple, spots that grow together as they spread. Snip away the speckled leaves and toss them, then carry on picking the clean outer ones. The real turning point comes from thinning the planting so fresh air can move through.
Fix:
- Remove and destroy infected leaves
- Harvest healthy outer leaves
- Improve air circulation by thinning
A tall seed stalk rises and the flavor sours
Bolting is simply the plant deciding to make seed instead of leaves, usually after a long hot stretch or, now and then, a cold snap early in its life. Once that central seed stalk climbs up, leaf growth eases off and the taste turns sharp. Gather the good leaves before they sour, then pull the bolted plant and sow a fresh batch, and you are right back on track.
Fix:
- Harvest remaining leaves before they turn bitter
- Pull bolted plants and resow for a fresh crop
Winding pale trails wandering inside the leaves
Those squiggly pale trails are the feeding tracks of leafminer grubs tucked between the top and bottom of the leaf. Lift a leaf toward the light and you can usually make out the little larva or the dark specks it leaves behind. Just pinch off the marked leaves and get rid of them right away, and a strong, happy plant will grow past the small loss without missing a beat.
Fix:
- Pick off and destroy mined leaves promptly
- Remove larvae by hand
- Keep plants vigorous so outer leaves can be sacrificed
Toxicity
For people, Swiss chard is a wholesome green to enjoy cooked or raw, with nothing poisonous to fret about. It does hold a good deal of soluble oxalates, which is only a mild caution for cats, dogs, horses, and grazing animals when they eat a lot of it over time. A little taste is harmless, so long as chard never becomes a steady part of any animal's meals.
Toxic to
Cats · Dogs · Horses · Rabbits · Livestock · Birds
Safe for
People
Cats Caution
Chard is not poisonous to cats, though its leaves do carry plenty of soluble oxalates. A curious nibble will do no harm, while a large helping eaten again and again can unsettle the gut and, over time, put a strain on the kidneys.
Dogs Caution
A few leaves are nothing for a dog to worry about. It is kindest to keep the portions small, since that high oxalate load can upset the stomach and, in big amounts, work against the kidneys.
Horses Caution
A small taste is perfectly fine for a horse, but chard carries more oxalate than is ideal for them. Steady, heavy grazing can unsettle the way the body manages calcium and lean on the kidneys.
Rabbits Caution
Rabbits can enjoy chard as one part of a varied leafy diet, though it is best not made a daily staple. The oxalates gather up over time, so it helps to rotate it with lower-oxalate greens rather than serving it on its own.
Livestock Caution
Goats, sheep, and cattle can handle a little chard with no trouble at all. It is the large, repeated helpings of these oxalate-rich leaves that can interfere with calcium and press on the kidneys.
Birds Caution
Backyard hens and pet birds are welcome to peck at a bit of chard from time to time. Because of the oxalates, treat it as an occasional treat rather than an everyday portion.
People Edible
For people, Swiss chard is a nourishing kitchen green, lovely cooked or raw and entirely safe to eat. The single thing to keep in mind is its high oxalate content, which mainly matters 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 set themselves apart by the color of their stalks and the feel of their leaves, and any of them is a joy to grow. Here are the ones you are most likely to meet at the seed rack.
Bright Lights
An All-America Selections winner, this one lights up the bed with stalks and midribs in a happy mix of red, pink, yellow, orange, and white.
Northern Lights
It carries that same cheerful range of color through its stalks and midribs, moving across red, pink, yellow, and white.
Ruby (Rhubarb) Chard
This one sets deep red stalks and veins against dark green, heavily savoyed leaves for a warm, striking presence in the bed.
Fordhook Giant
A dependable heirloom, it grows with real vigor, offering 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
The lovely thing about chard is that seed is all you ever need to get going. There is just one small quirk about that seed worth a friendly heads-up 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 could not be easier to raise from seed, sown in spring and once more in late summer for a fall crop. Here is the quirk worth knowing: each 'seed' is really a multigerm ball, a little dried fruit cluster that sends up several seedlings together, so once they appear just thin them to 4 to 6 inches apart. From sowing to your first full harvest takes about 50 to 60 days, and the wait is a gentle one.
Myths
Swiss chard needs constant replanting, the way spinach does, or it bolts on you.
Happily, chard takes heat and cold far more calmly than spinach and is much slower to bolt. A single sowing can keep you in leaves cut-and-come-again for a long season, so there is no need for the steady stream of replantings that spinach asks of you.