Why can't I buy the root bark of Bai Mei?

The supply is insufficient. The root bark in Bai Mei can't be bought mainly because of the current shortage of goods. This Chinese herbal medicine is easy to die in the process of planting and needs to be planted at an altitude of 400~2600 meters. Moreover, the market demand for Chinese herbal medicines is limited, mainly for pharmacies. Most farmers are unwilling to grow medicinal materials, and choose to grow crops or fruits.