What is the best ratio of water to sugar to use for feeding hummingbirds?

Four parts water to one part sugar (1/4 cup of sugar to every cup of water) best matches the sucrose content of natural flower nectar. Bring the solution to a boil, stir until the sugar is dissolved, let it cool, and then fill your feeders. Do not use molasses, honey, or artificial sugars. There is no need to add red food coloring. Bright red feeder parts or a bright red ribbon hung near the feeder can be just as attractive as red-dyed solution. Remember to change the nectar every three to four days to avoid mold.