Last Updated on September 17, 2026
How Many Swiss Chard Plants per Square Foot?
4 Swiss chard plants per square foot, 6 inches apart, is the number on my square foot gardening chart, for the standard way most people grow chard: picking a few outer leaves from each plant all season. Let plants grow to full size instead and you need more room, 1 to 2 per square, 8 to 12 inches apart. For baby leaf, thin only to about 4 inches apart, which fits 9 per square.
The spacing pattern
| Per square foot | 4 plants, on a 2 by 2 grid |
|---|---|
| Inches apart | 6 inches, plant to plant |
| 2 x 4 bed (8 squares) | up to 32 chard plants |
| 3 x 6 bed (18 squares) | up to 72 chard plants |
| 4 x 4 bed (16 squares) | up to 64 chard plants |
| 4 x 8 bed (32 squares) | up to 128 chard plants |
That 4 per square, 6 inches apart, is straight off my square foot gardening chart. Check any other bed size with the square foot garden calculator. The Plan My Garden planner instead gives the same crop one plant per 1 x 1 foot cell, 12 inches apart, sized for a plant grown to full size.
These bed counts are grid maximums for the chart’s 4-per-square spacing, not a planting target. For full-size chard, cut the counts by 4 (1 per square) or by 2 (2 per square), and give each plant 8 to 12 inches.
Why sources say 1, 4 or 9 chard plants per square foot
The numbers do not disagree so much as answer different questions: how big do you let the plant get before the first cut.
| Source | Spacing | Per square foot |
|---|---|---|
| Plan My Garden planner | one square per plant, full size | 1 |
| My square foot gardening chart | 6 inches apart | 4 |
| Utah State University Extension | 6 inches between plants in the row | 4 |
| University of Maryland Extension | thin to 4 inches for a young harvest; 8 to 12 inches for larger plants | 9 down to 1 to 2 |
The math: 12 inches divided by 4, squared, is 9 per square. Divided by 6 instead, it is 4, where my chart and Utah State University Extension land on the same number from two different starting points, mine for a bed and theirs for a row. At 8 to 12 inches it drops to 1 or 2 per square, University of Maryland Extension’s spacing once chard is past the baby stage. The planner’s single whole-plant square matches the wide end of that range.
Planting the square
- Start seed indoors 8 to 6 weeks before your last frost for a head start, about 1/2 inch deep, the depth University of Maryland Extension and Utah State University Extension both use.
- Set transplants out about 2 weeks before your last frost, the planner’s week. If you direct sow instead, Utah State University Extension times it the same way, 2 to 3 weeks before the last frost.
- Thin in stages: University of Maryland Extension sows 2 inches apart, thins to 4 inches for baby leaf (9 per square), then to 8 to 12 inches at maturity (1 to 2 per square). For the chart spacing, stop at 6 inches, 4 per square.
- Keep the soil evenly moist, 1 to 2 inches of water a week. Utah State University Extension says moisture swings toughen the leaves and bring on off flavors.
- Chard is semi-hardy and produces until a hard frost, so a second sowing in late summer, 3 to 4 weeks before your first fall frost, extends the harvest well past spring.
When to plant Swiss chard
These are the windows the Plan My Garden planner uses, counted from your average last spring frost. Turn the weeks into dates with the seed starting calendar, or enter your zip code on Plan My Garden to find your frost dates.
| Start indoors | 8 weeks before to 6 weeks before your last frost |
|---|---|
| Transplant out | 2 weeks before your last frost |
| Direct sow | No separate week in the planner. University of Maryland Extension direct seeds chard in early spring and again in late summer. |
| Days to maturity | about 55 days, inside University of Maryland Extension’s 50 to 70 day range from direct sowing, on my vegetable days to maturity chart |
| Frost tolerance | Semi-hardy on my vegetable frost tolerance chart, and produces until a hard frost |
Germination and where to get seed
From my Seed Germination Temperature Chart: chard germinates from 40°F, does best at 65-85°F, and the maximum is 95°F. Utah State University Extension gives a close range, best at 55-75°F, sprouting in 7 to 14 days, reduced above 80°F.
Wood Prairie’s organic Swiss chard seed includes Fordhook Giant (50 to 60 days, dark green leaves, white stems), Rainbow Chard (56 days, the mixed stem colors Tim’s own post points readers toward) and Ruby Red (60 days, also sold as Rhubarb Chard, candy-apple red stems). Code PMG5 takes 5 percent off.
Harvest the outer leaves, not the whole plant
My method with chard is simple: I harvest the outer leaves and let the plant keep producing right through the late fall, the way I describe in my post on crops you can direct sow before your last frost. Utah State University Extension backs the method up: older leaves are stripped off first so the young inner leaves keep growing, and if the growing point is not damaged, you can even cut all the leaves back to within 2 inches of the soil for new, tender growth. University of Maryland Extension adds that chard can be harvested clear until frost, leaves under 4 inches are the ones to eat fresh in salads, and larger, older leaves are better sauteed.
Chard is semi-hardy on the planner, producing until a hard frost, which matches University of Maryland Extension’s definition of semi-hardy: light frost is fine, a heavy frost or freeze is not. University of Maryland Extension notes chard is also the same species as beets, Beta vulgaris, grown for the leaf instead of the root; see how many beet plants fit per square foot. For another leafy green picked the same outer-leaf way, see how many spinach plants fit per square foot.
Quick questions
How many Swiss chard plants fit in a 4×8 raised bed?
Up to 128 at the standard 4 per square, 6 inches apart. Full-size plants fit fewer, 32 to 64 at 1 to 2 per square, and baby leaf chard can go up to 288 at 9 per square.
What is Swiss chard spacing in square foot gardening?
4 per square, 6 inches apart, on my square foot gardening chart. The Plan My Garden planner instead gives a full-size plant the whole square, one per square foot, 12 inches apart.
Can you plant Swiss chard closer together for baby leaf?
Yes. University of Maryland Extension thins seedlings to about 4 inches apart for a young harvest, which fits 9 per square, before thinning again to 8 to 12 inches as the plants mature.
How do you harvest chard so the plant keeps producing?
Cut the outer leaves first and leave the center growing point alone. I harvest the outer leaves and let the plant keep producing into late fall, and Utah State University Extension says you can cut all the leaves to within 2 inches of the soil and the plant will regrow, as long as the growing point is not damaged.
Let the planner place them
Plan My Garden is free to start: enter your zip code, draw your beds, pick chard and everything else you want to grow, and it places each plant at square-foot spacing and builds a planting schedule from your frost dates.
Related: Square Foot Gardening Chart · Seed Starting Calendar · 4×8 Raised Bed Garden Layout · How Many Beet Plants per Square Foot?
