|'Giant White Forcing' is an heirloom lettuce first introduced in America in the late 1800's. This is a medium-large lettuce with light green, brown fringed leaves and globe-shaped heads. The middle of the head is yellow. The foliage has a good taste, and a tender texture. Start from seed 4 to 6 weeks before average last frost date. Sow seeds 1/4 inch deep in wide rows and thin to 8 to 12 inches apart. Thinned seedlings can be replanted. Keep soil moist but not soggy. Protect from rabbits and slugs. Extend the harvest season by planting successive crops. Summer heat causes lettuce to bolt. Pick outer leaves as they grow or harvest all at once. Harvesting when weather or day temperature is cooler will result in crisper leaves. Do not harvest lettuces until you are ready to use it.