1. First, the Paeonia suffruticosa soil is sterilized “Sun Disinfection: spread the soil flat on the floor or on a wooden board and expose it to the sun for 2-3 days, turning over the soil; medicine disinfection: Commonly used medicaments are Formalin, potassium permanganate, iron(2+) sulfate (anhydrous) , thiophanate. Spread it out to 20 centimeters,