Calendulas vivid orange or yellow flowers provide not only a splash of color to the garden, but add zest to salads and similar dishes as well. Calendula is exceptionally tolerant of cold weather in fall, and has long been grown as a pot herb for its edible flowers.s vivid orange or yellow flowers provide not only a splash of color to the garden, but add zest to salads and similar dishes as well. Calendula is exceptionally tolerant of cold weather in fall, and has long been grown as a pot herb for its edible flowers.