In recent years, however, there have been a few challenges, including a decreasing number of cypress trees that are large enough, as well as a decreasing number of craftspeople to collect cypress bark known as motokawa-shi.
しかし近年は充分な樹径のあるヒノキの減少や、原皮師（もとかわし）と呼ばれる檜皮採取の職人の減少などの課題がある。