Crisp, sweet head lettuce is a mainstay for those first barbequed burgers and spring salads. Head lettuces, like iceberg and romaine, require cool temperatures and grow well in spring or fall in most zones.Gardeners in warmer climates with shorter cold periods may find they get no head on lettuce crops.ead lettuces, like iceberg and romaine, require cool temperatures and grow well in spring or fall in most zones. Gardeners in warmer climates with shorter cold periods may find they get no head on lettuce crops.