There are several types of bulb cuttings used to propagate crops such as Hippeastrum, Lycoris and Scilla. The two most common methods are bulb chipping and twin scaling.
For bulb chipping the entire bulb is cut into 8 to 10 vertical sections. Each bulb chip contains 4 or more scales and a part of the basal plate.
Twin scaling is similar except each chip only has two scales.
Twin Scaling
