Swiss chard is available from spring through the fall with a peak from June through October. Choose swiss chard that has crisp stalks and firm, bright leaves. Like other greens, chard should be wrapped in plastic and can be kept in the refrigerator for approximately 2 days. If blanched, swiss chard greens can be frozen. Boil greens for 2 minutes, drain, chill in ice water and drain again and pack in an airtight container.
Swiss chard is extremely versatile, has a mild sweet yet slightly bitter flavor (similar to beets), and has large green leaves with ribs running throughout. The leaves can be smooth or curly and are attached to fleshy, crunchy white, red or yellow celery-like stalks.
Swiss chard is an excellent source of vitamins A and C, and also contains potassium and fiber.