How to clean a hummingbird feeder and keep the nectar fresh
About 6 minutes to read. Published . By the House & Hedge team.
Nectar mixer
Work out how much white sugar to stir into your water for hummingbird nectar.
The amount of water you will use, in US cups.
Hummingbirds visit feeders often and drink a lot. The sugar water they feed on spoils quickly in warm weather. Old nectar ferments and grows mold, and a dirty feeder can make the birds sick. A feeder that is cleaned and refilled on a steady schedule is one of the simplest ways to keep these birds coming back, and the routine takes only a few minutes once it is set up.
The job has three parts: mixing the nectar at the right ratio, changing it on a schedule that fits the weather, and cleaning the feeder properly, so that residue and mold do not build up in the ports and the crevices.
The right nectar
Use one part white table sugar to four parts water. Boil the water first, which helps kill bacteria and lets the sugar dissolve quickly. Stir the sugar in until it is fully dissolved, then let the mix cool to room temperature before you fill the feeder. Hot nectar can damage the feeder, and it can stress the birds if it is served warm.
Do not use honey, brown sugar, raw sugar, molasses or artificial sweeteners. Honey ferments quickly and can grow fungus that is harmful to the birds. The other sugars do not give the birds the energy they need. Do not add red dye. The color is not needed, and the dye can harm the birds. Most feeders already have red parts that attract them.
Make a batch that you will use within a few days, and store the rest in the refrigerator in a sealed, labeled jar. Throw away any mix that is more than a few days old, even if it looks clear.
How the calculator works
The nectar mixer works out how much white sugar to stir into the water you plan to use. Enter the water in cups and it gives the sugar in cups, in tablespoons for a small batch, and in milliliters in brackets.
The rule is one part sugar to four parts water by volume, so the sugar is a quarter of the water: sugar = water / 4. A cup holds 16 tablespoons and 236.6 ml. With the default of 2 cups of water, the sugar is 2 / 4 = 0.5 cups, which is 8 tablespoons. The batch is 473 ml of water with 118 ml of sugar.
The ratio is not arbitrary. One part sugar to four of water is close to the sugar concentration of many natural flower nectars, so it gives the birds the energy they need without leaving the feeder syrupy. A stronger mix does not help them. It can crystallize in the feeder, leave a sticky film on the ports and draw in insects. A weaker mix may not supply enough energy for the birds’ fast, hovering flight.
The calculator assumes plain white table sugar and US cups, and it only gives amounts. The method stays the same: boil the water, stir in the sugar until it dissolves, and let the mix cool before you fill the feeder. Measure the sugar and the water rather than guessing. Make only as much as you will use within a few days, because the guide says to throw away mix that is more than a few days old, even if it looks clear.
Cleaning the feeder
Empty the old nectar and rinse the feeder with hot water. Use a bottle brush to reach the inside of the reservoir, and a small brush to scrub the feeding ports, because nectar residue sticks there. Rinse thoroughly several times, until no soap or cleaner is left.
Soap and detergent should not be used. Even small residues can harm the birds, and rinsing does not always remove them completely. Hot water and a brush do the job well for most feeders.
For mold or stubborn film, soak the feeder in one part white vinegar to four parts water for a few minutes. Scrub with the brush, then rinse several times until no vinegar smell remains. Dry the feeder fully before you refill it, because a wet feeder grows mold faster.
Check the feeder’s parts once a week. Look at the ports for dark specks, which are mold, and at the seal around the base for leaks. A cracked feeder can leak nectar, and that attracts wasps and ants, so replace any part that is damaged.
How often to change the nectar
In hot weather, change the nectar every two days. In cooler weather, every three to five days is usually enough. The aim is to keep the nectar fresh rather than to follow a fixed date, so look at the feeder each day. Cloudy nectar, a sour smell, or black specks in the reservoir all mean the nectar should be changed at once.
Empty and clean the feeder each time you change the nectar. Do not top up old nectar, because the fresh and the old ferment together and spoil quickly.
Where to hang the feeder
Hang the feeder in a shaded spot, out of direct sun. Sun heats the nectar and speeds up fermentation. Place the feeder either within about three feet of a window or well away from one, more than thirty feet if possible. Feeders placed at a middle distance can be struck by birds that fly at speed, and hummingbirds are injured that way.
Choose a height that is comfortable for you. A feeder hung too high is harder to reach for cleaning, and that makes it less likely to be cleaned as often as it should be.
Keeping ants out
Ants can climb the hanger and reach the nectar. An ant moat stops them. It is a small cup of water that the hanger passes through, and the ants cannot cross the water. Check the moat each time you refill the feeder, because it dries out or fills with dust and insects. Keep the moat topped up in hot weather, when it evaporates quickly.
Do not spray insecticide near the feeder, because the spray can drift onto the nectar and the birds.
Dealing with wasps and bees
Wasps and bees are drawn to sugar. Keep the feeder clean and check it often, because spilled nectar on the outside draws them in. Moving the feeder to a different spot sometimes helps. A feeder with a yellow flower-shaped guard, or with ports designed to limit access, can reduce the problem, and those designs are sold for the purpose.
Winter and cold weather
In some regions, hummingbirds stay through the cold months, and some people keep a feeder up all year. If you do, bring the feeder in on freezing nights, because nectar that freezes does the birds no good. Keep changing the nectar on the same schedule, since cold does not stop fermentation entirely. A heated feeder designed for cold climates is an option if freezing is common where you live.
Why the ratio matters
One part sugar to four parts water is close to the sugar concentration of many natural flower nectars, and it gives the birds the energy they need without leaving the feeder syrupy. A stronger mix does not help the birds. It can crystallize in the feeder, leave a sticky film on the ports, and draw in insects. A weaker mix may not supply enough energy for the birds’ fast, hovering flight. Stick to the ratio, and measure the sugar and water rather than guessing.
Other visitors to the feeder
Hummingbird feeders attract more than hummingbirds. Bees, wasps, flies, butterflies and sometimes other songbirds come to the sugar. Keep the feeder clean and the nectar fresh, and check the ports for insects that have drowned in the syrup. Feeders with small ports and a fast turnover of nectar limit the number of other visitors, and a feeder hung in a shady place attracts fewer flies.
Keeping a routine
Set a fixed day each week for a full clean, and check the feeder on the days in between. Keep a set of spare ports and a spare reservoir if you can, so a feeder can be swapped out while the other is cleaned and dried. A simple routine keeps the nectar fresh and the birds healthy, and it takes less time than most people expect.
What a clean feeder looks like
A clean feeder has clear nectar, a reservoir free of film, and ports that are open and dry. Hold the feeder up to the light and check the inside for a cloudy haze or a stripe of residue along the water line. Look straight into each port, and clear any blockage with a small brush rather than a pin, which can tear the port. If the feeder smells of anything other than sugar, wash it again before the next fill, because a strange smell means something is growing in it.
When to replace the feeder
Replace the feeder when the plastic is cracked, when the ports will not stay clean, or when the seal leaks. Glass feeders can be cleaned more easily than plastic, and a feeder with a removable base or a wide opening is much easier to clean thoroughly. The right design makes the job quicker and more likely to get done.
