If you have been disappointed by spinach bolting in June and have empty green space to fill, plant chard. It does not care about day length, does not rush to flower in heat, and produces more leaf per square foot over a longer season than almost any other green. One spring planting can supply your kitchen from May through the first hard frosts of fall, and a fall planting will produce through late autumn in most climates.
Chard also happens to be beautiful. The stems of varieties like 'Rainbow' or 'Bright Lights' run white, yellow, gold, pink, orange, and red. They earn their place in the ornamental garden as easily as the vegetable bed.
See the Swiss chard plant profile for variety comparisons. For other greens that follow similar seasonal patterns, see how to grow spinach, how to grow lettuce, and how to grow kale. For fall planting strategy, the fall vegetable garden guide is a useful companion.
When to plant Swiss chard
Unlike spinach, which bolts in long summer days and heat, chard is a biennial. It will not flower until it has experienced a full winter, so there is no bolting risk in the summer garden. You can plant it in spring, summer, or late summer for fall harvest.
Spring planting: Direct-sow in early to mid-May, a few weeks after your last frost date when soil has warmed slightly. Starting too early in cold, wet soil can cause premature bolting (the plant perceives a cold "winter" signal). Wait until soil temperature is consistently above 50 degrees F.
Fall planting: For a fall harvest and possibly a late-season cold-hardy crop, direct-sow or start transplants in late June to early July. Plants will produce into fall and often survive light frosts. A floating row cover can extend the harvest into late autumn.
Starting transplants: You can start chard indoors 4 weeks before transplanting for either season. For summer crops, start seed indoors in early April. For fall, sow indoors in June. Transplant 4 to 6 inches apart in rows 18 to 30 inches apart (UMN Extension).
Site and soil
Chard prefers full sun but tolerates partial shade better than most vegetables. In a spot with 4 to 5 hours of direct sun, it will still produce well, though growth slows compared to a full-sun bed.
Soil pH between 6 and 7 (slightly broader than most brassicas). Well-drained, fertile soil improved with compost or well-rotted manure. Chard is not as demanding as heavy feeders like cabbage, but it grows over many months and benefits from good starting fertility.
One garden-management note: chard is in the same family as beets. The same soil-borne diseases that affect beets (Cercospora leaf spot, for example) can affect chard. Rotating your chard planting with non-beet family vegetables from season to season is good practice. The crop rotation guide has the planning framework.
Sowing and planting
Chard seed is a cluster of seeds fused together, similar to beet seed. Each "seed" often contains 2 to 3 embryos, so even thin sowing usually results in clusters that need thinning.
Direct sowing Swiss chard
Prepare a firm seedbed
Work the top few inches of soil to break up clumps. Chard seeds germinate best in firm, consistent contact with the soil.
Sow 1/4 to 1/2 inch deep
Drop seeds every 2 to 3 inches along the row in rows 18 to 30 inches apart. Deeper sowing in dry conditions, shallower in cool wet soils.
Keep soil moist until emergence
Chard seeds are slow to germinate in cold soil but sprout reliably at 50 degrees F and above. Keep the seedbed consistently moist during the 7 to 14 days before emergence.
Thin in two stages
When seedlings are 2 inches tall, thin to 4 inches apart by snipping at the soil line (do not pull; you will disturb neighbors). Once plants are 4 to 6 inches tall and you can see which are strongest, thin again to 8 to 12 inches apart for full-size plants. Eat the thinnings.
Apply row cover if pests are present
If leaf miners or flea beetles have been a problem in your garden, lay row cover immediately after sowing and leave it on until plants are established.
Transplants: If you started seeds indoors, transplant at the 4-to-6-inch spacing, in rows 18 to 30 inches apart, on an overcast day to reduce transplant stress. Water in well. Chard handles transplanting better than many greens.
Use the spacing calculator to plan how many plants fit your bed.
Watering and feeding
Chard will survive drought, but it slows or stops producing during dry spells. It does not die; it just waits. When moisture returns, it picks up again. For continuous high-yield harvesting, provide 1 inch of water per week from rain or irrigation.
On sandy soils, water more frequently and check soil moisture more often than once a week. Mulching 3 to 4 inches deep helps smooth out moisture fluctuations, keeps roots cool through summer heat, and suppresses weeds. See the mulching guide.
A light side-dressing of balanced organic fertilizer at planting and again halfway through the season keeps the leaves coming. Nitrogen is the key nutrient for leafy growth, but chard does not need heavy feeding. Too much nitrogen on chard in warm weather can push soft, water-logged leaves that are prone to pest damage.
Harvesting: the cut-and-come-again system
This is what makes chard exceptional. You do not harvest the whole plant. You harvest outer leaves continuously, leaving the center rosette to keep producing.
Cut-and-come-again harvesting
Start when outer leaves are 6 to 8 inches tall
Pick leaves that are fully expanded and mature, starting with the outermost. Leave at least 4 to 5 inner leaves intact at the center so the plant keeps growing.
Cut at the base of the stem
Snap or cut each stem close to the base, not partway up. A clean cut heals cleanly and does not leave a stub that can rot.
Harvest regularly
Do not let outer leaves get old, yellow, or damaged. Removing them regularly keeps the plant tidy and productive and tells the plant to keep pushing out new leaves from the center.
Scale up in cool weather
Chard growth slows in peak summer heat. In spring and fall, with cooler temperatures and shorter days, the plant produces the fastest and the leaf quality is best. Scale up harvests during those windows.
Common problems
Chard has a simpler pest picture than the brassicas, but a few things need watching.
Leaf miners: The primary pest of chard. The larvae of small flies tunnel through leaf tissue, leaving winding pale trails visible through the leaf. Affected leaves are still edible if you remove the mined portions, but heavy infestations reduce yield significantly. The most effective prevention is floating row cover applied at sowing and kept on through the season. Remove any leaves showing mines to interrupt the life cycle.
Slugs: Slugs feed at night and chew ragged holes in leaves, especially in cool, wet conditions and heavily mulched beds. Iron phosphate slug bait is safe around vegetables. Diatomaceous earth around the perimeter works as a barrier. Reduce slug habitat by raking back mulch from the base of plants in wet weather.
Aphids: Chard can host aphid colonies on the undersides of leaves, especially in spring. A firm water blast on the underside of affected leaves dislodges most infestations. Insecticidal soap handles persistent colonies.
Heat stress: Chard does not bolt in heat, but in very hot weather (above 90 degrees F for extended periods) leaf production slows and leaf quality declines. This is temporary; the plant rebounds once temperatures moderate. Consistent watering and mulch are the best tools for getting through heat stretches.
Tipburn: Brown, papery edges on inner leaves, caused by calcium uptake being outpaced by rapid growth. More common in hot, fast-growing conditions. Consistent moisture prevents most of it.
Chard has good disease resistance compared to most greens. Cercospora leaf spot (reddish-purple leaf spots) is the most common disease in some regions but rarely severe enough to threaten the planting.
Is Swiss chard easy to grow?
Yes, and it is one of the most forgiving greens in the garden. It tolerates heat without bolting (unlike spinach), handles light frosts in fall, produces for months from a single planting, and does not require complicated timing. The main things to get right are consistent watering, thinning to proper spacing, and harvesting outer leaves regularly to keep the plant productive.
When should I plant Swiss chard?
In most climates, direct-sow in early to mid-May after your last frost date for a spring-through-fall harvest. You can also sow in late June to early July for a fall crop. Chard can be started indoors 4 weeks before the last frost and transplanted out. Look up your specific dates with the frost dates tool and planting calendar.
How do I harvest Swiss chard so it keeps producing?
Harvest outer leaves only, snapping or cutting each stem close to the base. Leave 4 to 5 inner leaves on the plant at all times. The center rosette continues to push out new leaves as long as you keep taking the outer ones. Do not harvest more than one-third of the plant at a single picking.
How far apart should I space Swiss chard?
For full-size plants, thin to 8 to 12 inches apart in rows 18 to 30 inches apart. For baby leaf harvest (smaller leaves, more frequent picking), you can keep plants at 4 to 6 inches. The spacing calculator will help you plan how many plants fit your bed.
Can I grow Swiss chard through summer heat?
Yes. Unlike spinach, chard does not bolt in heat or long days because it is a biennial that requires a full winter cycle to flower. Growth slows in the hottest weather, but the plant stays in production. Keep it well watered during heat stretches and it will continue to produce usable leaves all summer. The best leaf quality comes in spring and fall when temperatures are cooler.