The invention belongs to the technical field of 
dahlia cultivation, and particularly relates to a 
dahlia dwarfing treatment method. A dwarf variety is adopted, 
cutting seedlings are selected, and theaperture of a pot for an initially-planted 
seedling is 8-12 cm. When the height of the seedlings reaches up to 15 cm, the seedlings are planted in a large pot with the 
caliber of 22-28 cm; soil for 
potting is prepared by uniformly mixing 4-5 parts of garden soil, 3-5 parts of 
river sand and 2-3 parts of 
compost soil, coarse sand with the thickness of 2-3 cm is spread on the pot bottom, 0.1 part ofdecomposed cake 
fertilizer powder is added on the coarse sand, and culture soil with the thickness of 0.1-0.2 cm covers the decomposed cake 
fertilizer powder, thenseedlings with soil lumps are planted, watering is conducted in the 
growing season when 
dryness and wetness appear, illumination needs to be conducted for no less than 8 hours every day in the growing period, thin cake 
fertilizer liquidneeds to be topdressed once every half a month in the growing process, after 
budding, the thin cake fertilizer liquid is applied once every week, and 
monopotassium phosphate liquid with the concentration of 0.2% is sprayed once or twice. The method has the advantages that the operation is simple, the obtained 
dahlia pinnata has high ornamental value, and the height of the dahlia pinnata after 
dwarfing treatment is 30-40 cm; the method has remarkable 
economic benefits and is worthy of being widely popularized.