The formation of seedstalks, bolting, is caused by a combination of long days, warm temperatures and age. When seedstalks begin to form, harvest lettuce immediately and store in the refrigerator. Leaf lettuce matures faster, and most varieties of leaf-type lettuce will mature in six to seven weeks from seeding. Head lettuce varieties often require 10 to 11 weeks and have many more disease problems. Refrigeration is not necessary for germina-tion.
Light is required for germination.
Lettuce should be planted in early spring as soon as the ground can be worked. For fall planting, temperatures should average below 80 degrees F to assure maximum germination and growth of young seedlings. A. Most home garden lettuce, especially the Bibb variety, goes to seed or bolts quickly in high temperature, long-day conditions and develops bitter flavor in hot weather. Buttercrunch, Saladbowl, Ruby and Romaine are more tolerant of these conditions and remain sweet and tender for a longer period. The Arkansas Cooperative Extension Service offers its programs to all eligible persons regardless of race, color, national origin, religion, gender, age, disability, marital or veteran status, or any other legally protected status, and is an Equal Opportunity Employer.