|'White-Seeded Tennisball', also known as 'Gotte Jaune d'Or', 'Golden Tennisball', and 'Golden Forcing', is an heirloom type. It is an extremely small tennisball lettuce easily grown in flats. The heads never exceed 8 inches across, and are loose and twisted with crinkled bright yellow-green leaves that have a tender texture. Right before bolting, the lettuce forms a tight head, which is the best time for harvest. This lasts only a day or two. 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.