Perennial
medicinal plant, height up to 120 cm. It is grown by sowing
seeds in a permanent place. It is used in medicine as an expectorant, in the form of infusions and decoctions. The roots are prepared in autumn or spring. The rhizomes are washed, cleaned, and dried immediately. yellowing, at a temperature not higher than 35 ° C. Stored in a closed container for 2-3 years.