Store in plastic bags in the refrigerator for up to 3 weeks. Ideal storage is 32 to 40 degrees F and 90 to 95 percent humidity. Simply use the best storage available, and recognize its limitations. Cool, but nonfreezing temperatures retard vegetable deterioration. Harvest when the swollen stems are 2-3 inches in diameter.
Stems become woody if left too long before harvest or if grown under poor conditions.
Cut off root and leaf stems, and store in plastic bags as indicated for carrots. Storage life is 2 to 4 weeks. Head, semi-head and leaf lettuce can be stored up to 2 weeks in perforated plastic bags in the refrigerator. Refrigeration is highly desirable, but do not freeze. Ideal storage is 32 to 40 degrees F and 90 to 95 percent humidity.