Following World War II, a number of trends made the Japanese tradition of bonsai more and more accessible to Western and world audiences. One key trend was the increase in the number, scope, and prominence of bonsai exhibitions. For example, the Kokufu-ten bonsai displays reappeared in 1947 after a four-year cancellation and became annual affairs. The displays are by invitation only for eight days in February, and continue to this day. In October 1964, a great exhibition was held by the private Kokufu Bonsai Association, reorganized into the Nippon Bonsai Association, in Hibya Park to mark the Tokyo Olympics. A commemorative album Gems of Bonsai and Suiseki was published in Japanese and English. The largest (both in quantity and quality) of exhibitions are held in Japan.
Another key trend was the increase in books on bonsai and related arts, now being published in English and other languages for audiences outside Japan. In 1952, Yuji Yoshimura, son of a leader in the Japanese bonsai community, collaborated with German diplomat and author Alfred Koehn to give demonstrations and the first formal bonsai courses opened to the public and outsiders in Tokyo. Koehn had been an enthusiast before the war, and his 1937 book Japanese Tray Landscapes had been published in English in Peking. Yoshimura’s 1957 book The Art of Bonsai, written in English with his student Giovanna M. Halford, addressed both cultivation and aesthetic aspects of bonsai growing and went on to be called the “classic Japanese bonsai bible for westerners” with over thirty printings. The related art of saikei was presented to English-speaking audiences in 1963 in Kawamoto and Kurihara’s Bonsai-Saikei. This book described tray landscapes made with younger material than was traditionally used in bonsai, providing an alternative to the use of large, older plants, few of which had escaped war damage.
Other works in Japanese and English had been published by this time, and afterward a tremendous number of books saw print. Translations and original volumes in over two dozen languages were published in the next few decades. The number of clubs outside of Asia increased once Japanese was no longer the sole language of bonsai, and interaction increased between members of all levels of experience.
A third trend was the increasing availability of expert bonsai training, at first only in Japan and then more widely. In 1967 the first group of Westerners studied at an Ōmiya nursery. Returning to the U.S., these people established the American Bonsai Society. Other groups and individuals from outside Asia then visited and studied at the various Japanese nurseries, occasionally even apprenticing under the masters. These visitors brought back to their local clubs the latest techniques and styles, which were then further disseminated. Japanese teachers also traveled widely, bringing hands-on bonsai expertise to all six continents.
By the beginning of the 1970s, these trends were beginning to merge. A large display of bonsai and suiseki was held as part of Expo ’70, and formal discussion was made of an international association of enthusiasts. Three monthly magazines were started this year: Bonsai Sekai, Satsuki Kenkyu, and Shizen to Bonsai. In 1975, first Gafu-ten (Elegant-Style Exhibit) of shohin bonsai (13-25 cm (9.84 in) (5–10 in) tall) was held. So was the first Sakufu-ten (Creative Bonsai Exhibit), the only event in which professional bonsai growers exhibit traditional trees under their own names rather than under the name of the owner. It was organized by Hideo Kato (1918–2001) at Daimaru Department Store in Tokyo.
The First World Bonsai Convention was held in Osaka during the World Bonsai and Suiseki Exhibition in 1980. Nine years later, the first World Bonsai Convention was held in Omiya and the World Bonsai Friendship Federation (WBFF) was inaugurated. These conventions attracted several hundreds of participants from dozens of countries and have since been held every four years at different locations around the globe: 1993, Orlando, Florida; 1997, Seoul, Korea; 2001,Munich, Germany; 2005, Washington, D.C.; 2009, San Juan, Puerto Rico.
The final trend supporting world involvement in bonsai is the widening availability of specialized bonsai plant stock, soil components, tools, pots, and other accessory items. Bonsai nurseries in Japan advertise and ship specimen bonsai world-wide. Most countries have local nurseries providing plant stock as well, although finding specimen bonsai is more difficult outside Japan and bonsai enthusiasts will often start with local trees that have not been pre-shaped into candidate bonsai. Japanese bonsai soil components, such as Akadama clay, are available worldwide, and local suppliers also provide similar materials in many locations. Specialized bonsai tools are widely available from Japanese and Chinese sources. Potters around the globe provide material to hobbyists and specialists in many countries.
Bonsai has now definitively reached a world-wide audience. There are over twelve hundred books on bonsai and the related arts in at least twenty-six languages available in over ninety countries and territories. A few dozen magazines in over thirteen languages are in print. Several score of club newsletters are available on-line, and there are at least that many discussion forums and blogs. Educational videos and just the appearance of dwarf potted trees in films and on television reach a wide audience. There are perhaps hundreds of thousands of enthusiasts in over a thousand clubs and associations worldwide, as well as an unknown number of unassociated hobbyists. Plant material from every location is being trained into bonsai and displayed at local, regional, national, and international conventions and exhibitions for enthusiasts and the general public.