Article (website)  (1998)  Page(s) 3.  
 
Nagao Soseien, under the management of Nagao, issued in 1908 the first Plant shipping catalogue of the prefecture. 112 Peony varieties were listed on the first page, among them five sorts like 'Hokan' von Nagao and 'Himegozen', bred by Watanabe Yokichi from the town Kosudo.