Miniatures are gaining in popularity as borders. They are very prevalent in Asia and grow two to four feet. Some varieties for sunflowers have one big head or flower. They are usually the giant varieties. Other large headed varieties, have a few much smaller heads form on lower branches.
Some varieties have multiple heads.
These are typically mid sized sunflowers and are perfect for flower gardens in attracting birds. Seeds from sunflowers are usually a dark brown to black, or large, medium grey and white striped. The latter being most popular for eating due to their large size. Don't worry over selection. The birds will eat ample quantities of both and so will you.