Quick answer
Whole black oil sunflower seed feeds the widest range of birds, holds up in wet weather and usually costs less per bag, but it leaves a pile of hulls. Sunflower hearts are the same kernel without the shell: no mess and eaten by even more birds, but they spoil faster when wet. Striped sunflower suits cardinals, jays and grosbeaks.
In this guide
If you only buy one bag, make it black oil sunflower seed in the shell. It feeds more kinds of backyard birds than any other seed and works in almost every feeder. Sunflower hearts, the same seed with the shell removed, are the better choice when the mess under the feeder matters: over a deck, a patio, a flower bed or a neighbor's walkway. Striped sunflower is a narrower pick for big-billed birds like cardinals and jays.
The right answer depends on where your feeder hangs, which birds you want, and how wet your weather is. Here is how the three compare.
Black oil, striped and hearts at a glance
| Seed | Who eats it | Mess | Feeder fit |
|---|---|---|---|
| Black oil sunflower (in shell) | Nearly every seed-eating feeder bird: chickadees, titmice, nuthatches, finches, cardinals, jays, grosbeaks, woodpeckers | Thin shells pile up below the feeder | Tube, hopper, platform, mesh |
| Striped sunflower (in shell) | Birds with strong bills: cardinals, jays, grosbeaks, titmice. Harder for small-billed birds such as House Sparrows | Larger, thicker shells, more debris | Hopper, platform, tubes with large ports |
| Sunflower hearts and chips (hulled) | Everything that eats black oil, plus birds that struggle with shells, such as juncos and native sparrows | Almost none | Tube, mesh, hopper, covered platforms |
For a wider look at every common seed, see our guide to types of bird seed.
Black oil sunflower: the all-rounder
Black oil sunflower seeds are small, with a thin black shell that even a chickadee or goldfinch can open. The kernel is rich in fat, which is exactly what small birds need to get through a cold night. That combination is why black oil draws a wider range of feeder birds than any other single seed.
The shell is its drawback. Every seed a bird opens drops a hull, and over a winter those hulls build into a thick mat that smothers grass and breaks down slowly. Hulls also collect moisture and can grow mold if they are left in a heap.
The shell is also an advantage. It protects the kernel from rain, so whole black oil holds up better in wet weather than hulled seed, and it stores well in a sealed can. More on its benefits is in our guide on whether black oil sunflower seed is good for birds.
Best for
- A single all-purpose feeder over lawn or open ground, where hulls can be raked up.
- Wet or humid climates, where hulled seed spoils fast.
- Feeding many birds on a budget, since whole seed usually costs less per bag.
Sunflower hearts and chips: no shells, no pile
Sunflower hearts are black oil kernels with the shell already removed. Chips are the same kernels broken into pieces, sold as medium or fine chips. The birds get the same food without the work of cracking it, and you get no hull pile under the feeder.
A bag of hearts costs more than the same size bag of whole seed, but there is no shell weight in it. Everything in the bag is food, and nothing is left behind to rake up. Birds also eat hearts faster, because they don't spend time cracking shells, so a feeder may empty sooner.
The trade-offs
- They spoil faster. Without a shell, the kernel soaks up rain and humidity. Wet hearts clump, mold and turn rancid. In damp weather, put out only what the birds finish in a day or two, and use a feeder with a roof and drainage holes.
- They draw a crowd you may not want. European Starlings and House Sparrows, which have a harder time with shells, eat hulled seed readily. Squirrels love hearts too.
- They need cleaner feeders. Crumbs and damp fines settle at the bottom of tube feeders, so shake them out at every refill.
Fine sunflower chips are a favorite of goldfinches and Pine Siskins. Offer them in a mesh feeder, where the birds can cling and pull, alongside or instead of nyjer.
Best for
- Feeders over a deck, patio, balcony, driveway or flower bed.
- Window feeders, where hulls would pile up on the sill.
- Apartments and homes with neighbors close by, where mess causes friction.
- Ground feeding in dry winter weather for juncos and sparrows.
If mess is your main concern, our guide to no-mess bird seed covers other hulled options.
Striped sunflower: for big-billed birds
Striped sunflower seeds are the larger, gray-and-white-striped kind. The shell is thicker and tougher, and the kernel carries less oil than black oil. Cardinals, Blue Jays, grosbeaks, titmice and some woodpeckers handle them well. Small finches and House Sparrows have a much harder time.
That makes striped a useful tool rather than a staple. If House Sparrows are crowding out everything else, switching one feeder to striped sunflower, or to safflower, can tilt it back toward cardinals, titmice and jays. The comparison is covered in our guide to safflower vs sunflower seed. The cost is a smaller variety of visitors and bigger hulls to clean up.
A rule of thumb by feeder type
| Feeder | Best sunflower choice | Why |
|---|---|---|
| Tube with standard ports | Black oil or hearts | Striped seeds are often too big for small ports |
| Finch tube with tiny slits | Neither; use nyjer | Sunflower won't pass through the slits |
| Mesh feeder | Hearts, chips or black oil | Clinging birds pull seed through the mesh |
| Hopper | Black oil; striped for cardinals and jays | Roofed hoppers keep seed fairly dry |
| Open platform or tray | Black oil or striped; hearts only in dry weather | Hulled seed soaks up rain on an open tray |
| Window or deck feeder | Hearts | No hulls on the sill or the boards |
Using two kinds at once
Many yards do best with a split. Fill the feeder closest to the house with hearts, where hulls would land on the deck or in a flower bed, and put whole black oil in a feeder farther out over the lawn. Birds move freely between the two, and you save money on the feeder that doesn't need hulled seed.
Seasons can guide the split too. In a cold, dry winter, hearts on a covered platform feed juncos and sparrows well. In a rainy spring or a humid summer, whole seed is the safer choice, and hearts belong only in a well-roofed feeder that empties quickly.
Not sure which feeder you have? Our guide to tube vs hopper bird feeders explains the differences.
Buying and storing: what to do this week
- Buy raw, unsalted seed only. Salted or seasoned sunflower seeds sold as a snack are not suitable for birds.
- Check freshness. Good seed smells nutty, not musty or sour. Walk away from bags with clumps, webbing or moths.
- Buy hearts in smaller amounts. Hulled seed goes stale and rancid sooner than whole seed, so buy what you will use in a few weeks.
- Store it in a metal can with a tight lid, somewhere cool and dry. That keeps out moisture, mice and insects.
- Match seed to spot. Whole black oil over the lawn, hearts over hard surfaces and beds, striped or safflower where sparrows take over.
- Clean up under the feeder. Rake or sweep hulls every week or two so they don't mold or smother the grass.
Questions people ask
Are sunflower hearts better than black oil sunflower seeds?
Not better, just different. Hearts leave no hulls and almost every seed-eating bird can eat them, but they cost more per bag and spoil faster in wet weather. Whole black oil is the better all-round seed for most yards.
What is the difference between sunflower hearts and sunflower chips?
Hearts are whole hulled kernels; chips are the same kernels broken into pieces. Fine chips suit small birds like goldfinches in mesh feeders.
Is black oil sunflower better than striped?
For most yards, yes. Black oil has a thinner shell that more species can crack, and more fat. Striped is useful when you want to favor cardinals and jays over small-billed birds.
Do sunflower hearts go bad?
Yes, faster than whole seed. Without a shell they absorb moisture, clump and mold. Store them sealed in a cool, dry place and put out only what birds will finish in a day or two in damp weather.
Written by the Backyard Birdcam team with AI assistance. Found something we got wrong? Email shop@smarternewsnow.com and we will fix it. How we write our guides.
