It is the leaves of the species that are collected at the time of bloom and dried in the shade. This species is a perennial and shrubby plant with a height of 50-100 cm, purplish-blue flowers, and simple leaves. It is found wild in Central Europe and the Western Balkans. It is rarely grown in gardens in Turkey. Appearance: 3-8 cm long and 1-4 cm wide, with slightly toothed edges, densely hairy, and silvery simple leaves on both sides.
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