Sow seeds 1/4 to 1/2 inch deep. Seeds need soil temperatures between 50-75 degrees F to germinate. Sow 3 seeds every 18 inches, with rows 2 ft. apart.
Collards need regular water and a good compost or fertilizer at least once a month. i feed mine fish emulsion once a month.
To harvest avoid the oldest leaves. Harvest by cutting upper leaves (if you wish to keep an on going crop), otherwise harvest the entire plant.