In addition to attracting cardinals, grosbeaks and downy woodpeckers, you can also attract chickadees, titmice and nuthatches. Did you know that there are birds out there that hog your bird feeders? Some of these types of birds are grackles, starlings and blackbirds. Using safflower seeds in your birdseed mix will deter these types of birds.
Safflower seeds are found in quality wild birdseed mixes and are expensive. Very rarely will you find them in bird seed mixes at grocery stores. Look for a wild birdseed mix that offers safflower seeds in it if you wish to attract cardinals to your yard.
Supposedly squirrels will ignore feeders with safflower seeds because they find them bitter. If you have a chipmunks in your yard, you may not want to use this type of seed because they love it.