The Japan Rose Society was founded in 1948 and became the juridical foundation in 1962, authorized by the Ministry of Agriculture. The purpose of the Society is: to encourage people to plant roses throughout the nation, to preserve the environment, and to encourage rosarians to exchange information and knowledge internationally.
The Japan Rose Society conducts International Rose Trials every year in cooperation with Metropolitan Tokyo, at the Jindai Botanical Garden.
It publishes a monthly Rose Letter and an Annual Report for members. It also holds Rose Exhibitions nationally and locally in spring and in autumn. A unique activity of the Society is to provide newly bred rose stock to each member every spring.
Fees:
Regular member - 10,000¥ annually
Nurseries and Distributors - 30,000¥ annually
Corporate - 100,000¥annually
Foreign - Please inquire
| 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 |
12th 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 | Shinjyuku Tokyo |
R | JRS & Jindai Shokubutsu Botanical Garden |
Autumn Rose Show Contact: rose.society@mx2.ttcn.ne.jp |