Agave is also included in artificial sweetness materials which are not perfect for hummingbirds. When we compared the agave with normal nectar from the natural flowers, it’s not making up of same molecules. Actually the agave is made up of plat’s sap rather than the flowers so it’s don’t contain the sucrose as compared to natural nectar.
Sucrose is the dominant sugar available in natural flowers. So we are strict to use the white sugar nectar with ratio 1:4 which is closely related to natural nectar obtain from flowers. It’s the most attractive artificial nectar for birds.