100 seeds. Centranthus ruber. Perennial.
 
Common names are Red Valerian and Jupiter's Beard.
 
Hardy to zones 4 to 9.
 
Height 36 inches. Spacing 15 inches. 
 
Sowing Centranthus ruber Seeds
 
Start seeds indoors 6 to 8 weeks before the last frost date. Or sow outdoors in late spring. Barely cover the seeds with soil. Full sun to part shade.