How to Grow Collard Greens

The niche: one green for three seasons

Most cool-season greens bolt or turn bitter in heat; collards keep going. UF/IFAS Extension describes them as both heat and cold tolerant — able to grow in below-freezing temperatures, with established plants lasting well into summer — which is why a spring planting can still be feeding you when fall crops go in. NC State notes they are among the most popular garden vegetables in the South and increasingly grown in northern states.

They still prefer cool weather, and the best-eating leaves mature in it. Clemson's planting windows run early spring (March to June in the Piedmont, from February on the coast) and again August through October for fall — the fall crop, finished in cool weather and touched by frost, is the classic one.

Mature plants withstand frosts and light to medium freezes, so in much of the South the harvest runs well into winter.

Planting and spacing

Direct-seed or transplant. Spacing depends on your harvest plan, per NC State: 2 to 4 inches for young tender plants, 10 to 15 inches if you will cut plants half-grown, and 15 to 18 inches for full-size plants (Clemson uses 6 to 18 inches in-row with rows 18 to 36 inches apart). Full-grown collards are big — Florida guidance simply says plant them 2 to 3 feet apart.

Count on 60 to 80 days from direct seeding to full harvest size. Collards are heavy feeders: side-dress with a nitrogen source three to four weeks after planting and again three to four weeks later, and keep moisture even to at least 6 inches deep.

Rotate like any brassica and watch for the family's pests — imported cabbageworms, cabbage loopers, diamondback moths, and harlequin bugs are the main ones Clemson lists.

Harvest bottom-up, and the plant keeps giving

The harvest method is what makes one planting last months: break off individual leaves starting from the bottom of the plant and move up over time, taking only a few leaves per plant at each pass so it can recover. The plant keeps growing from the top of the center stem, leaving a palm-tree look by late season.

Alternatively, cut whole plants when half-grown or full-grown if you spaced for it.

For the fall crop, keep harvesting through frosts — mature plants take light to medium freezes — and finish the stand before a hard freeze threatens.

Sources

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

• Clemson Cooperative Extension HGIC — Collards — Spring and fall planting windows (Piedmont Mar 15-Jun 30 and Aug 1-Sep 30; coastal Feb 1-Jun 15 and Aug 1-Oct 30); mature plants withstand frosts and light to medium freezes; rows 18-36 inches with plants 6-18 inches in-row; ready 60-80 days after direct seeding; harvest by breaking off individual leaves from the bottom up, a few per plant; side-dress nitrogen 3-4 weeks after planting and again 3-4 weeks later; water to 6 inches deep; pests include cabbageworms, loopers, diamondback moth, harlequin bugs.
• NC State Extension — Collard Greens — Collards are among the most popular garden vegetables in the South and increasingly grown in northern states; plant seeds in early spring or midsummer, transplants in early spring or late summer; space 2-4 inches for young plants, 10-15 inches for half-grown harvest, 15-18 inches for full-size plants; recommended varieties include Vates and Georgia Southern.
• UF/IFAS Extension Hillsborough County — Growing Collard Greens in the Florida Vegetable Garden — Collards are both heat and cold tolerant, can grow in below-freezing temperatures, and established plants last well into summer heat; continually harvest the lower leaves and the plant keeps growing from the top of the center stem; space 2-3 feet apart as plants grow large.

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