Late 18th century; earliest use found in John Ash (1724–1779), lexicographer and grammarian. From post-classical Latin anthomania from antho- + -mania.
Definition of anthomania in US English:
anthomania
nounˌanθə(ʊ)ˈmeɪnɪə
rare
Excessive or passionate enthusiasm for flowers.
Origin
Late 18th century; earliest use found in John Ash (1724–1779), lexicographer and grammarian. From post-classical Latin anthomania from antho- + -mania.