Black oil sunflower seeds are the single most popular seed for different bird species. A key component of many birdseed mixes, black oil sunflower seeds, are also available without other seeds mixed in. These seeds are also often formed into seed blocks and cakes, often with whimsical shapes such as hearts, bells or wreaths for holidays.
Black oil sunflower seeds have a high oil content that appeals to the majority of bird species, including cardinals, chickadees, sparrows, finches, titmice, woodpeckers, grosbeaks, and jays. As a smaller type of sunflower seeds, black oil seeds are also more economical because a single bag will contain more seeds than a similarly sized bag of striped sunflower seeds. Bird gardeners can also grow black oil sunflower seed during the summer months and birds will strip the seeds from the flower heads when the plants mature.