The principle is to cut out some of the bulb to allow the growth of the plant to be controlled, dispensing with unwanted leaves and buds. Removing a piece of the bulb reduces the nutrition available, shortens the leaves and brings an early blossom.
它的原則是：切去部份鱗莖，以觀察掌握花葉生長、淘汰冗葉、剔除贅芽；切除的鱗片會減少養分供給，矮化莖葉，提早開花。