|'Mignonette' is an heirloom variety which comes in two variations, one with green leaves, and one with bronze. This is a curled heading lettuce with crumpled leaves. The heads grow to 7 inches, with savoyed outer leaves. For best-shaped heads, plant 1 foot apart. The green variety is susceptible to slugs. Start from seed 4 to 6 weeks before average last frost date. Sow seeds 1/4 inch deep in wide rows and thin 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.