As you probably know, many of the larger moths like the Luna cannot feed as adults. However, some moths like the Sphinx Moths will feed on flowers that are open at night. One all-time favorite for moths is Common Milkweed. Common Milkweed is open at night and seems to be an excellent nectar source for moths, butterflies and bees. For the day-flying moths, Common Milkweed is also excellent and Shasta Daisy is a favorite.