The reasons are:

1. The number of wild Bergamot yam has decreased, and it is difficult to expand the scale of planting. Many businesses have begun to trade through illegal means such as smuggling, resulting in chaos in the Bergamot yam market.

2. The cost of growing bergamot yam is relatively high. Some unscrupulous merchants will use untested pesticides, fertilizers and other chemicals, which will bring safety risks to the planted bergamot yam.