Inspect the cabbage heads to determine maturity once the heads begin reaching full size. Harvest fully developed heads that feel firm.
Slide a knife between the base of the head and the soil. Cut through the cabbage stalk.
Store the harvested cabbage in the refrigerator for up to two weeks. Pull off the outer leaves and wash the head prior to use.
Harvest cabbage plants a second time, if desired. Inspect the remaining stalks in the garden bed every two weeks and harvest the small sprouts that form once they are between 2 and 4 inches in diameter.