How to Grow Swiss Chard

A crop that tolerates both ends of the season

Swiss chard's advantage over spinach and lettuce is range. Young plants take temperatures down to 32°F without serious damage, and while it grows best when temperatures stay below 75°F, it keeps producing through summer heat that would bolt other greens. That makes a single spring planting capable of feeding you into fall.

It prefers fertile, well-drained soil rich in organic matter. Sow the spring crop 2 to 3 weeks before the anticipated last frost, or count back 50 to 75 days from your desired fall maturity date for a fall crop.

The when-to-plant-swiss-chard calculator localizes those windows to your frost dates.

Sowing, spacing, water, and feed

Plant seed half an inch deep; it takes 7 to 14 days to emerge and germinates best at 55 to 75°F, with germination dropping off above 80°F. Space plants 6 inches apart in rows 12 inches apart. Transplants take about 5 to 6 weeks to reach planting size.

Supply 1 to 2 inches of water per week to keep leaves tender and growing steadily. Side-dress with a nitrogen fertilizer — about a quarter cup of 21-0-0 per 10 feet of row — roughly 4 weeks after transplanting.

The how-often-to-water-swiss-chard and growing-swiss-chard-in-containers calculators cover those inputs on their own.

Cut-and-come-again harvest and problems

Chard is built for repeat harvest. Cut all the leaves off to within about 2 inches of the soil, taking care not to damage the growing point, and the plant regrows a fresh flush — or pick outer leaves individually and leave the center to keep going.

Because you harvest continuously, keep water and nitrogen steady so regrowth stays fast and tender.

The pests Utah State Extension notes on chard are aphids, slugs, and flea beetles. Elsewhere leaf miners tunneling the leaves and fungal leaf spot are common chard problems; the swiss-chard-leaf-spot calculator addresses that disease on its own.

Sources

Reviewed 2026-07-18. We cite university Extension, government, and established horticultural sources — and never invent pesticide rates or dangerous treatments.

• Utah State University Extension — Swiss Chard in the Garden — Swiss chard prefers fertile, well-drained soils rich in organic matter; plant spring crop 2-3 weeks before the anticipated last frost and fall crop 50-75 days before the anticipated maturity date; temperatures down to 32°F do not seriously damage young plants and it grows best when temperatures do not exceed 75°F; sow 1/2 inch deep, seeds emerge in 7-14 days and germinate best at 55-75°F with germination dropping above 80°F; space 6 inches between plants with rows 12 inches apart; transplants need 5-6 weeks to reach planting size; supply 1-2 inches of water per week; side-dress 1/4 cup 21-0-0 per 10 feet of row 4 weeks after transplanting; harvest by cutting all leaves to within 2 inches of the soil without damaging the growing point; pests include aphids, slugs, and flea beetles.

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