Drones are being used to help restore vegetation to mountainous parts of western Japan where torrential rains caused 8,500 landslides last July.
Drone operators based in Tokyo and Hiroshima held a trial operation Tuesday on a mountainside in the city of Kure in Hiroshima Prefecture.
A drone carrying three kinds of seeds flew up to the summit.
It is designed to automatically sow seeds in areas of 100 square meters where brown soil is exposed on the surface.
The drone operators will check each month to see whether the seeds planted by the aircraft have taken root.
Kazuya Shiraishi, a senior official at the Tokyo drone operating company, says he hopes the test will cheer up people living in the area.