Swiss chard: Spacing, Yield & Planting Dates
Plant count & yield calculator
Pre-filled for this crop — adjust bed size or pick a different vegetable.
Enter bed size to count plants.
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Seed starting dates
Pre-filled last frost — change the date to rebuild the full crop schedule. For Swiss chard with this frost date : start indoors ~Mar 18, transplant ~Apr 1, direct sow ~Mar 18 .
Pick a last frost date for the schedule.
Your result
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Assumptions and formulas will appear here once you calculate.
About swiss chard
Swiss chard bridges the gap between spring greens and summer heat, producing colorful, heat-tolerant leaves long after spinach and lettuce bolt.
Spacing & yield
Swiss chard wants 8×18 inches and about 2 lb per plant at ~60 days to maturity.
Growing tips
- Soak seeds overnight before planting to speed germination of the corky seed coat.
- Harvest outer stems at the base with a clean cut to keep the crown producing.
- Grow rainbow varieties for edible ornamental value in raised beds and borders.
- Side-dress with compost at midseason; chard is a heavier feeder than most greens.
Common mistakes
- Pulling leaves instead of cutting, which can damage the crown.
- Ignoring leaf miners — remove affected leaves promptly to break the lifecycle.
Harvest & storage
Cut outer stalks when 8-10 inches tall, beginning around 60 days from sowing and continuing for months.
Refrigerate stalks in a damp towel; stems keep longer (7 days) than leaves (3-4 days).
Companion planting
Good neighbors for swiss chard: beans, cabbage, onions, lettuce. Avoid planting beside: corn, cucumbers.
Planting calendar
Start indoors about 4 weeks before last frost, then transplant 2 weeks before frost. Direct sow is also an option around 4 weeks before frost. Use the seed-starting calculator above with your real county frost date — the April 15 default is only a worked example (zone 6 style).
Estimates only — consult your local extension office for advice specific to your land and animals.
Frequently asked questions
- What spacing does Swiss chard need?
- Plant 8 inches apart in rows 18 inches apart; each multi-stemmed plant needs this room to produce well.
- How much does one chard plant yield?
- A vigorous plant produces roughly 2 lb of leaves and stems over a full growing season.
- Is Swiss chard heat-tolerant?
- Yes — unlike spinach, chard handles summer heat without bolting, producing harvests for 60+ days in most climates.