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Collards 'Flash' is a fast-maturing, smooth-leafed green brassica grown for its tender, nutrient-dense leaves used in southern cooking, salads, and sautés. This cultivar is prized for its speed to harvest and uniform plant habit, making it ideal for succession planting and shorter growing seasons. Gardeners grow collards for reliable, cold-hardy harvests and excellent flavor, especially after frost sweetens the leaves.

Collard seeds germinate in 7–10 days at soil temperatures between 70–85°F. They prefer darkness to germinate and do not require pre-treatment. Sow at 0.5 inches depth; keep soil consistently moist until seedlings emerge.

Start seeds indoors 4–6 weeks before last spring frost, or direct sow outdoors 2–3 weeks before last frost. Sow seeds 0.5 inches deep and space seedlings or thin to 12–18 inches apart in rows 18–24 inches apart. Transplant seedlings when they have 2–3 true leaves. Collards tolerate light frost and are best planted for spring harvest or late summer/fall harvest in zone 7.

Water consistently to keep soil evenly moist; mulch to retain moisture and regulate soil temperature. Apply a balanced fertilizer or side-dress with compost every 3–4 weeks. Collards are relatively pest-resistant but watch for cabbage worms and flea beetles; use row covers for young plants or hand-pick pests. They are cold-hardy and actually improve in flavor after light frosts.

Begin harvesting outer leaves 50–60 days after transplant when they reach 8–12 inches long, cutting at the base of the petiole. Continue harvesting lower leaves as the plant grows, allowing the crown to develop new growth for continued production. Leaves are sweetest and most tender after a frost. Store unwashed leaves in a plastic bag in the refrigerator for up to two weeks.