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Curly kale is a cold-hardy leafy green with deeply frilled, dark green leaves prized for both fresh eating and cooking. It's a nutrient-dense vegetable high in vitamins A, C, and K, and becomes sweeter after frost. Gardeners grow it for reliable fall and winter harvests, ornamental appeal, and exceptional hardiness.

Curly kale germinates best at soil temperatures between 65–75 °F and typically sprouts in 7–10 days. Seeds can be sown indoors 4–6 weeks before the last spring frost, or direct-sown outdoors in late summer for fall harvest. Light is not required for germination; seeds germinate equally well in darkness or light.

Start seeds indoors in seed trays or cells, pressing seeds lightly into moist soil without covering them completely. Transplant seedlings outdoors when they have 2–3 true leaves and are 3–4 inches tall, spacing plants 12–18 inches apart in full sun and well-draining, fertile soil. For fall and winter harvest in Maryland, direct-sow or transplant in late July through August so plants mature as temperatures cool. Hardened-off transplants tolerate cold better than tender seedlings.

Water consistently to keep soil evenly moist but not waterlogged; kale is drought-tolerant once established but tastes better with steady moisture. Feed with a balanced fertilizer or side-dress with compost every 3–4 weeks. Curly kale is generally pest-resistant but watch for cabbage worms, flea beetles, and aphids—use row covers in early season or hand-pick pests. Kale does not require staking. Remove lower, older leaves as the plant grows to encourage upward growth and improve air circulation.

Begin harvesting outer leaves when plants are 12 inches tall, typically 8–10 weeks after sowing. Pinch or cut leaves from the bottom upward, leaving the central growing point intact to encourage continued production. Kale is extremely cold-hardy and sweetest after light frosts; harvest through winter in Maryland until temperatures drop below 10 °F or the plant flowers in spring. Fresh leaves keep in the refrigerator for up to 2 weeks; for longer storage, blanch and freeze.