In the attached greenhouse Kaga devoted his time to study and the selective breeding of orchids he had been obsessed with since his time in Britain, and he finally published a picture book of flowers called "Rankafu" (Genealogy of Orchids) before he died in 1954.
加賀は併設された温室でイギリス時代以来夢中だった洋蘭の研究や品種改良を進め、『蘭花譜』という図録を出版し、1954年に死去した。