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Black oil sunflower is the best single seed for American backyards — it brings in the widest range of species and nothing else comes close as an all-rounder. If squirrels or grackles are the problem, safflower is the one worth knowing about: cardinals and finches take it, those two largely will not. Avoid cheap mixes heavy in milo, red millet and wheat.
Seed choice is where most money gets wasted in bird feeding, and the waste is not obvious because it happens on the ground. A bargain mix looks like good value in the bag. What happens at the feeder is that birds pick out the sunflower, sweep the rest onto the lawn looking for more, and you buy another bag sooner than you expected.
Seed preference has been studied properly — large-scale trials by the US Fish & Wildlife Service in the 1970s and 80s, and ongoing preference data from Project FeederWatch. The findings are consistent and not especially complicated.
If you remember four things
- Black oil sunflower is the best all-round seed. If you buy one thing, buy this
- Safflower is taken by cardinals and finches, largely refused by squirrels, grackles and starlings
- Milo, red millet and wheat are the fillers that end up on the ground
- Straight seed usually beats a mix. One or two feeders with single seeds waste far less
The seeds worth buying
Black oil sunflower
The default, and deservedly. A thin shell that small birds can crack, and a high oil content that delivers a lot of energy per seed. Cardinals, chickadees, titmice, nuthatches, finches, jays, grosbeaks and woodpeckers all take it.
Drawback: shells. A busy feeder produces a substantial pile of hulls underneath, which needs raking and which will kill grass over a season. Sunflower chips solve that but cost considerably more and spoil faster once wet.
Safflower
The genuinely useful trick in bird feeding. Cardinals take it readily, along with House Finches, chickadees, titmice, doves and grosbeaks. Squirrels, grackles and European Starlings generally will not — it is bitter and they mostly leave it alone.
That makes a safflower-filled hopper one of the few solutions with no mechanism to fail, no weight-triggered parts to seize, and no maintenance.
Drawback: it costs more than sunflower, goldfinches take little interest, and birds need a few weeks to accept it after a switch. Do not conclude it failed after four days. Some determined squirrels do eventually learn to eat it.
Nyjer
Tiny black seed, imported and heat-sterilized so it cannot germinate. Goldfinches, Pine Siskins and redpolls are the audience, and it needs a feeder with very small ports or a mesh sock.
Drawback: expensive, and it goes stale faster than any other common seed. Stale nyjer is refused outright, and it is the single most common reason a finch feeder that worked in October is being ignored in January. Buy small quantities more often.
White proso millet
The one filler that is not filler. Ground-feeding birds — juncos, doves, native sparrows, towhees — genuinely prefer it. Best scattered on the ground or on a low tray rather than in a hanging feeder.
Drawback: House Sparrows and cowbirds also love it, so if either is already a problem, millet will make it worse.
Peanuts
High fat, taken by jays, woodpeckers, chickadees, titmice and nuthatches. Whole in a mesh feeder, or pieces in a hopper.
Drawback: peanuts are the seed most prone to aflatoxin, a mold toxin that is dangerous to birds. Buy fresh, store dry, and discard any that smell musty or look discolored. Whole peanuts are also worth avoiding right at nest sites during breeding season, where they can be carried to young too small for them.
Cracked corn
Cheap and taken by doves, jays, juncos, sparrows and quail. Fine in small amounts scattered on the ground.
Drawback: it spoils fast when wet, is prone to aflatoxin, and attracts everything — including deer, raccoons and rodents. Put out only what will be gone in a day.
Suet
Not a seed, but the other winter staple. Rendered fat, usually in cakes, and the reliable way to bring in woodpeckers along with nuthatches, chickadees and wrens.
Drawback: plain suet softens and turns rancid above roughly 90°F, and melted fat can foul feathers. Use no-melt dough cakes in summer or take it down in hot weather.
What to avoid
| Ingredient | What happens |
|---|---|
| Milo / sorghum | Large reddish round seed. Largely rejected by feeder birds in the East and Midwest. Some western ground-feeders take it. Mostly ends up on the lawn |
| Red millet | Not the same as white proso millet. Widely refused |
| Wheat and oats | Cheap bulk. Taken by House Sparrows and pigeons; ignored by most of the birds you want |
| Whole striped sunflower in a small-bird mix | Shell is too thick for chickadees and finches. Fine for cardinals and jays, wasted on anyone else |
| Dyed seed and “gourmet” mixes with dried fruit | Fruit tends to go moldy in a feeder. Dye serves the buyer, not the bird |
| Bread, salted nuts, anything from the kitchen | Bread has almost no nutritional value for birds. Salt is harmful |
How to read a label
Ingredients are listed by weight, heaviest first. Read the first three and you have the mix.
Good: black oil sunflower first, then white proso millet, sunflower chips or peanut pieces.
Bad: milo, sorghum, wheat, red millet, oats, or “grain products” in the first three. That is a bag priced by weight rather than by what birds eat.
You can check without buying: hold the bag up and look. Milo is unmistakable — large, round, reddish-brown. If a lot of the bag is that, put it back.
The arithmetic is worth doing once. A bargain mix at half the price of straight sunflower is not cheaper if 60% of it ends up on the ground. Cost per bag is the wrong measure; cost per pound actually eaten is the right one, and by that measure straight black oil sunflower usually wins outright.
Matching seed to birds
| If you want | Offer | In |
|---|---|---|
| The widest mix | Black oil sunflower | Tube or hopper |
| Cardinals | Safflower or black oil sunflower | Hopper or platform |
| Goldfinches | Nyjer, sunflower chips | Nyjer feeder or mesh sock |
| Woodpeckers | Suet, peanuts | Suet cage, peanut feeder |
| Chickadees and titmice | Black oil sunflower, peanut pieces | Tube |
| Juncos and sparrows | White proso millet | Ground or low tray |
| Jays | Peanuts, striped sunflower | Platform |
| Fewer squirrels and grackles | Safflower | Hopper |
Storage
Seed spoils, and spoiled seed causes aspergillosis. Keep it in a sealed metal or heavy plastic container somewhere cool and dry — metal if rodents are around, since they chew through plastic bins. Buy quantities you will use within a month or two rather than the largest sack available, and discard anything clumped, dusty, musty-smelling or sprouting.
Common questions
What is the single best bird seed?
Black oil sunflower. It attracts the widest range of species and delivers the most energy per seed for the money. If you only ever buy one thing, buy this.
Do squirrels really not eat safflower?
Most do not. It is bitter and squirrels, grackles and starlings generally leave it alone, which makes it genuinely useful. Some individual squirrels do learn to eat it, so treat it as a strong deterrent rather than a guarantee.
Is milo bad for birds?
Not harmful, just largely unwanted. Feeder birds in the East and Midwest mostly refuse it, though some western ground-feeders take it. In a mix sold in most of the country it is filler that ends up on the lawn.
Why do birds throw seed on the ground?
They are sorting. If a mix contains a lot of seed they do not want, they sweep it aside to reach the sunflower. Switch to straight sunflower and the mess drops sharply.
Can I feed birds bread?
Better not to. Bread offers very little nutritional value and fills birds up in place of food that would actually sustain them. Leftover bread also molds quickly and attracts rodents.
How long does bird seed keep?
Stored cool, dry and sealed, most seed keeps a few months. Nyjer is the exception and goes stale within weeks. If seed smells musty, is clumped, has a dusty bloom or has sprouted, throw it out — moldy seed causes aspergillosis.
Related guides
Sources: US Fish & Wildlife Service seed preference trials (Geis, A.D., Relative Attractiveness of Different Foods at Wild Bird Feeders); Project FeederWatch, Feeding Birds and food preference data; Cornell Lab of Ornithology, All About Birds; National Audubon Society; USGS National Wildlife Health Center on aflatoxin and aspergillosis; university extension service seed guidance.
Restocking?
Black oil sunflower feeds the widest range of species for the money. Check the label for milo and red millet — cheap mixes pad the weight with seed most backyard birds throw on the ground.
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