Mesclun/spring mix is a blend of tender baby lettuces and other greens. The exact mix can vary depending on the season and supplier, but common components include baby green and red romaine lettuces; baby green and red oakleaf lettuces; baby greenleaf and redleaf lettuces; baby green and red butter lettuces; baby green and red chard; baby spinach; arugula; beet tops; frisee; lolla rosa; mache; mizuna; radicchio; tango; and tatsoi.