How often should I clean my hummingbird feeder to prevent mold?

At minimum, every time you change the nectar. In summer, that means every 2--3 days. Even if the nectar looks fine, mold and bacteria can grow faster than they're visible. Make cleaning a habit every time you refill.

Is the black stuff in my feeder always mold?

Not necessarily — it can also be algae or simple sugar residue discolored by heat. But the safe assumption is to treat any dark growth as mold and clean accordingly. The cleaning protocol is the same either way.

Can I use just hot water without bleach?

Hot water removes visible residue but does not kill fungal spores or bacteria reliably. Bleach is necessary for a true disinfection. If you're opposed to bleach, a 5% white vinegar solution is a safer alternative, though it requires a longer soak (30+ minutes) and may not kill all fungal organisms as effectively.

Will birds get sick from one drink of contaminated nectar?

A single exposure is unlikely to cause serious illness. Ongoing exposure — visiting a contaminated feeder daily for weeks — is the real danger. The infection builds over time. This is why regular cleaning on schedule, not just reactive cleaning when you see mold, is critical.

How do I know if a hummingbird has a fungal infection?

Signs include lethargy, extended perching, visiting the feeder but seeming unable to feed effectively, and progressive weakness. A bird showing these signs needs immediate wildlife rehabilitation care. Contact a rehabber via [[ahnow.org]{.underline}](http://ahnow.org). **Clean Feeder, Healthy Birds** The hummingbirds visiting your feeder can't tell you the nectar is contaminated. They'll keep drinking until they can't feed anymore. The protection is entirely on your end. Every time you fill your feeder with fresh NectarBloom nectar — pure cane sugar, no artificial additives — you're starting with a clean foundation. Pair that with a proper cleaning protocol and a consistent change schedule, and you're giving every bird at your feeder the safest possible feeding environment. **Keep your feeder clean and your nectar pure. NectarBloom — because what you put in your feeder matters to every bird that drinks from it.**

Black Mold in Your Hummingbird Feeder — Is It | NectarBloom™