300 seeds. Rubeckia tribola. Perennial. 
 
Also known as Brown-Eyed Susan. Hardy in zones 3-9. 
 
Height 3-4 feet. Spacing 18 inches.
 
Sowing Rubeckia tribola Seeds
 
Place in a damp paper napkin in a plastic bag, and refrigerate 3 months before starting indoors. Barely cover the seeds with soil. Or sow outdoors in fall. Full sun to part shade.
 
Photo courtesy of Diane's Flower Seeds