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Omiya has been an old time favorite destination for Bonsai enthusiasts travelling into Japan. The village is a pleasant neighborhood in Omiya (a suburb of Tokyo) that hosts about a dozen top Bon-sai nurseries. The gardens can be visited on a daytrip from Tokyo, but make sure you arrive early to have the place for yourself. Please note most gardens are closed on Thursdays.
When I visited Omiya Bonsai village the newly built Bonsai Art Museum was still closed; be sure to visit as it opened in 2010. The museum features an impressive collection of masterpiece Bonsai trees, read below for more information. The house of the four seasons is interesting to visit as well and has information about local Bonsai workshops and fairs; one Bonsai workshop is available every 3rd Sunday of the month, between 1.30 and 3.00pm at the Bonsai Art Museum, Saitama (2500 Yen). On May 3-5 the local Bonsai festival is held.
I may not have the knowledge but I have some search skills.
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