1. **Snowdrops' numbers are decreasing sharply**: Due to over-excavation, snowdrops in Xinjiang are facing the crisis of species extinction, and in order to protect the rare snowdrop resources, Urumqi may take measures to prohibit the sale of snowdrops.
2. **Enforcement of laws and regulations to protect wildlife**: The Chinese government cracks down on illegal and criminal activities that destroy wildlife resources, and the city of Urumqi may be banning the sale of snowdrops in order to protect wildlife and avoid illegal activities.
3. **Protection of the ecological environment**: The environment in which snow lotus grows is very special and requires specific natural conditions and growth environment. If it is over-harvested, it may cause damage to the ecological environment. In order to protect the ecological environment, the sale of snow lotus may be prohibited in Urumqi.
In short, the ban on the sale of snowdrops in Urumqi may be due to the protection of wildlife resources, the protection of the ecological environment as well as the fight against illegal digging and other considerations. It is recommended to further understand the specifics in the relevant departments.