Willow, willow, willow, willow, willow… The bark, leaves and inflorescences of this tree are used for medicinal purposes. The bark is collected before flowering, during sap flow, from trees 6-7 years old. The removed bark is cut into pieces, dried in the sun and dried in a dryer at a temperature of 50-60 ° C. Finished raw materials should break easily and not bend. The bark is stored in cardboard containers for four years. Male inflorescences (catkins) are picked at the time of flowering.