The Japan Rose Society was founded in 1948 and became a juridical foundation in 1962, authorized by the Ministry of Agriculture. The purposes of the Society are to encourage people to plant roses throughout the country, to preserve a pleasant environment, and to promote the exchange of information on roses among rose lovers of the world.
The Japan Rose Society conducts International Rose Trials every year in cooperation with Metropolitan Metropolis at the Jindai Botanical Garden.
It publishes a monthly journal, Rose Letter, and an Annual Report for members. It also gives national and local Rose Exhibitions in spring and in autumn. A unique activity of the Society is to provide a newly bred rose for its members every spring.
Fees:
Regular members - ¥ 10,000 annually
Nurseries and Distributors - ¥ 30,000 annually
Corporate - ¥ 100,000 annually
Overseas members - Please contact the office
| Area & First Bloom Date | Main Bloom Date |
| Hokkaido Region- Spring bloom - Mid June | End of June - Beginning of July |
| Hokkaido Region- Autumn bloom - Mid September | End of September |
| Tohoku Region- Spring bloom - Mid June | End of June |
| Tohoku Region - Autumn bloom - End of September | Beginning of October |
| Kanto Chubu Region - Spring bloom - Mid May | End of May |
| Kanto Chubu Region- Autumn bloom - Mid October | End of October |
| Kansai Region - Spring bloom - Early May | Mid May |
| Kansai Region - Autumn bloom - Beginning of October | Mid October |
| Chugoku-Shikoku Region - Spring bloom - Beginning of May | Mid May |
| Chugoku-Shikoku Region - Autumn bloom - Early October | Mid October |
| Kyushu Region - Spring bloom - Beginning of May | Mid May |
| Kyushu Region - Autumn bloom - Beginning of October | Mid October |
| C-convention F-festival L-lecture M-meeting R-rose show S-seminar T-trials |
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| Early May - early June | Approximately 70 local areas | R | Regional Rose Societies | Spring Rose Shows |
| Early June | Central part of Japan | R | Regional Rose Societies | |
| Middle of May | Eastern part of Japan | R | Regional Rose Societies | |
| May 12-17 | Seibu Dome, Tokorozawa City, Saitama, Pref. |
R L |
International Rose & Gardening Show Committee & JRS |
14th International Rose & Gardening Show Contact: rose.society@mx2.ttcn.ne.jp |
| End of June | Tokyo | M | JRS | Annual Council Meeting Contact: rose.society@mx2.ttcn.ne.jp |
| September - November | Approximately 70 local areas | R | Regional Rose Societies | Autumn Rose Shows |
| May - October | Jindai Shokubutsu Botanical Garden Tokyo | T | JRS (JRC Committee) |
Japan Rose Concours (International Rose Trials) Contact: JRS rose.society@mx2.ttcn.ne.jp |
| November 1-4 | Shinjuku Tokyo |
R | JRS & Jindai Shokubutsu Botanical Garden |
Autumn Rose Show Contact: rose.society@mx2.ttcn.ne.jp |