The name comes from Carolus (Charles). According to medieval folklore, Charlemagne, or Charles the Great, used this root to cure the ills of his troops. Stemless or short-stemmed, pure white blossoms with silver bracts when mature. Since the blossoms open on dry days and close in the evenings and rainy days, we get the common name, Weather Thistle.
Natural Flowering Period: July - August.
Hardiness Zones: 4-9.
Growth Habit: Low growing rosettes.
Foliage: Reddish-bronze, deeply dissected leaves with hairy undersides.