The short answer
Check the feeder frequently and replace nectar before it spoils. Heat, sunlight, and contamination can change how quickly maintenance is needed; there is no single interval that is safe in every yard.
A full reservoir is not a target
A larger fill can mean more unused nectar rather than more convenience. Start with less and learn your own maintenance rhythm. Discarding old nectar is part of care, not a reason to keep it longer.
Use a condition-based checklist
Look at appearance and the cleanliness of the reservoir and ports. If you see cloudiness or contamination, remove the nectar and clean the feeder. Do not keep adding fresh nectar on top of an old batch.
Keep the recipe simple
Cornell’s guidance uses plain white sugar and water at a ratio of one part sugar to four parts water. Avoid added coloring. Prepare only what you can handle hygienically and consult the source for preparation and storage guidance.
At a glance
| Situation | Response |
|---|---|
| Warm, sunny conditions | Check more often; offer a smaller fill |
| Cloudy or contaminated nectar | Discard and clean |
| Uncertain cleaning date | Clean and restart the record |
| Frequent leftover nectar | Reduce the next fill |
Sources & evidence
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