25 seeds. Liatris spicata. Perennial.
 
Liatris 'Floristan Violet' has dense spikes of purple flowers that start blooming in mid-summer. Also known as Dense Blazing Star. Hardy in zones 3-10.
 
Height 36 inches. Spacing 15 inches.
 
Sowing Liatris Seeds: 
 
Start seeds indoors in winter and refrigerate for 8 weeks. Barely cover the seeds with soil. Full sun to part shade.