Question: do you need to refrigerate homemade hummingbird nectar?
Answer: There are steps you can take to keep it fresh and healthy for hummingbirds for a little while longer, however, to ensure less nectar is wasted and no birds are endangered by spoiled nectar. ... If larger quantities are made, store leftover, unused nectar in the refrigerator for up to 7-10 days to keep it fresh before use.