Tube feeders: what they do well, and the four ways they fail

The short answer

• A tube feeder is a vertical seed column with ports and perches, and it suits small perching birds: chickadees, titmice, nuthatches, finches and house finches.
• Port and perch geometry decides your species list. Short perches exclude cardinals and doves; long perches or a tray under the tube let them in.
• Fill it with black oil sunflower or sunflower hearts. Mixes containing milo and wheat clog tubes and get raked out onto the ground.
• Four failure modes account for nearly every dead tube feeder: wet seed at the base, a chewed plastic port, seed that never reaches the bottom, and a tube that cannot be taken apart to wash.

A tube feeder is a clear vertical cylinder with feeding ports down its sides and a perch at each port. Seed falls under gravity, so the column feeds itself, and the ports meter it out a few seeds at a time. That single design decision, seed inside a closed column rather than open on a tray, is what makes tubes the most common feeder in North American yards: the seed stays dry, it stays cleanish, and small birds can feed one at a time without a queue on a shared platform.

It also explains everything a tube feeder is bad at.

What a tube feeder is actually selecting for#

A perch that sticks out 2 in from a smooth plastic tube is a comfortable place to stand if you weigh 11 g and are used to hanging off twigs. It is a hopeless place to stand if you weigh 120 g and normally feed on the ground. So the feeder is not neutral: it hands your seed to a specific guild of birds.

Top top-tier favorite Yes eats readily Some takes occasionally Rare rarely No not a feeder food

Read down the sunflower column and the pattern is clear. Chickadees, titmice, nuthatches and finches all rate black oil sunflower at the top and all use a tube happily. Cardinals rate it just as highly and mostly cannot use the feeder. Mourning doves are not going to try.

That mismatch is the single most useful thing to understand about tube feeders. When people say "I only get little brown birds", the feeder is usually doing exactly what it was built to do.

Ports, perches and seed size#

Tube feeders come in two port sizes and the difference is not cosmetic.

If you already own a sunflower tube and want goldfinches, the answer is not to pour nyjer into it. Buy a dedicated nyjer feeder, or switch the tube to sunflower hearts, which goldfinches take just as readily and which every other bird on the list eats too.

Perch length is the other lever. Under about 2 in you have a small-bird-only feeder. At 4 in and above, cardinals and grosbeaks can balance. Some tubes sell "short perch" as a grackle deterrent, and it does work on grackles, but it works on cardinals at the same time.

The four ways tube feeders fail#

Nearly every complaint about a tube feeder is one of these four, and three of them are fixable without buying anything.

1. Wet seed welds itself to the base#

Rain runs down the outside of the tube, and humid air condenses inside it. The lowest inch of seed sits in that damp, swells, and sets into a plug. The feeder now looks full and delivers nothing, and the plug grows mold. This is the most common tube feeder failure by a wide margin.

The fix is a base you can remove. Any tube whose bottom cap unscrews or unclips can be emptied and brushed; any tube whose base is glued or riveted will eventually become a disposable item. Check this before buying, and never fill a tube more than you will get through in two weeks. For what grows in that plug and why it matters, see moldy seed.

2. A squirrel chews a port into a hole#

Plastic ports are soft. One determined gray squirrel can open a 3/8 in port into a 2 in hole in an afternoon, and after that the tube drains every time it is filled. Metal port surrounds prevent it; so does hanging the tube where squirrels cannot reach it at all, which is a geometry problem, not a shopping problem.

3. The seed never reaches the bottom#

Tubes over about 30 in tall with only two port levels leave a dead zone: birds empty the top ports, and the seed below the lowest port never moves. It sits there for months, oxidises, and goes rancid. If your feeder has a permanent inch of dark seed at the bottom, that is what you are looking at. Use a shorter tube, or accept that you have to empty it fully each time rather than topping up.

4. It cannot be taken apart#

A feeder you cannot fully disassemble cannot be properly washed, and a feeder that cannot be washed will eventually make birds ill. Before buying, take the lid off in the shop and ask whether every internal surface can be reached with a brush. See how to clean a bird feeder for the routine, and diseases at feeders for the reason it is not optional.

Filling it: what belongs in a tube#

Tube feeders reward single-seed filling. There is no tray for a bird to sort on, so anything a bird does not want gets flicked out of the port and lands on the ground.

Prices are 2026 United States big-bag benchmarks used as defaults in our seed cost calculator. Swap in your own and the ranking can change; the edible fraction and energy columns will not.

• Black oil sunflower is the default. Broadest appeal of any single seed, flows well, and the thin hull is easy for small bills. The hull is the cost: about a quarter of what you buy ends up on the ground.
• Sunflower hearts are the no-mess option and the right choice over a deck or patio. Nothing is wasted, but they still cost more per pound eaten than black oil does, so treat them as the answer to mess rather than a saving. Full working in cost per calorie.
• Safflower is the squirrel-and-grackle answer. Cardinals, chickadees and house finches take it; grackles and most squirrels do not. Expect a two to three week adjustment period while the regulars work out that it is food.
• Shelled peanuts work in a wide-port tube and bring in titmice, nuthatches and woodpeckers, but they absorb water fast and must be kept small in volume and changed often.

What does not belong: any mix containing milo, wheat, oats or cracked corn. Those are ground-feeding foods, and in a tube they are simply raked out. See reading a birdseed mix label.

Making a tube feeder squirrel-resistant#

A bare tube is not squirrel-resistant in any useful sense. Three approaches work, in this order of reliability:

1. A wire cage around the tube. Nothing to wear out, and it excludes grackles and starlings as a bonus. Small birds pass through a 1.5 in mesh; squirrels and large birds do not. See caged versus weight-activated feeders.
2. Correct pole geometry with a baffle. More effective than any feeder if you have the space: a baffle top at 4.5 to 5 ft with 7 to 10 ft of clear air around the pole beats every mechanical feeder ever made. Check yours with the baffle placement calculator.
3. A weight-activated tube. Effective, but it has a mechanism, and mechanisms in weather eventually fail. Worth it on a hanging line where a pole baffle is not possible.

Is a tube the right feeder for you?#

A tube is the correct first feeder for most yards, and the wrong only feeder for most yards. It covers the small perching birds thoroughly and covers nothing else. Two additions turn it into a full station: a suet cage for woodpeckers, nuthatches and wrens, and either a tray under the tube or a low ground tray for juncos, sparrows and doves.

If you are choosing between designs rather than adding to one, work through how to choose a bird feeder, or answer five questions in the feeder selector and it will rank the options against your actual yard.

Frequently asked questions#

What is the best seed for a tube feeder?

Black oil sunflower or sunflower hearts. Both flow freely, both suit the small perching birds a tube is designed for, and neither jams the ports. Sunflower hearts have no hull, so nothing is dropped and nothing rots underneath, but they cost roughly twice as much per pound and spoil faster in rain. Avoid supermarket mixes containing milo, wheat or oats: tube-feeding birds flick them out to reach the sunflower, and you end up with a mound of rejected grain under the feeder.

Why do birds throw seed out of my tube feeder?

They are sorting. When a mix contains seeds a bird does not want, it uses its bill to sweep them aside to reach the ones it does. The fix is not a bigger tray, it is a better seed: fill the tube with a single seed the visiting species actually eat. If they are throwing out sunflower too, the seed is probably stale or damp, or the ports are too small for the seed size.

Can cardinals use a tube feeder?

Only if it gives them somewhere to stand. A cardinal weighs about 45 g and will not cling to a 2 in perch stub. Add a wrap-around tray to the base of the tube, or choose a tube with 4 in perches, and cardinals will feed on it. Otherwise they will take the seed the small birds knock down and feed on the ground below, which is why cardinals are usually the last bird to appear at a bare tube.

How often should a tube feeder be cleaned?

Every two weeks in mild dry weather, weekly in heat, humidity or heavy traffic. Empty it completely, brush the tube out with a long bottle brush, wash in hot soapy water, soak for ten minutes in one part household bleach to nine parts water, rinse thoroughly and let it dry all the way through before refilling. The base is where problems start, so check it even when the rest looks clean.

Are metal tube feeders worth the extra money?

If you have squirrels, yes. A squirrel can chew a plastic port into a hole large enough to drain the whole tube in one afternoon, and once one port is gone the feeder leaks seed permanently. Metal ports, or a full metal-and-glass body, remove that failure mode entirely. On a squirrel-free balcony, plastic is fine and easier to see the seed level through.

Sources and further reading

1. Types of Bird Feeders Cornell Lab of Ornithology, Project FeederWatch Feeder designs, the species groups each attracts, and cleaning method and bleach dilution
2. Bird Feeding and Care National Audubon Society General feeder placement and food guidance