Fleurir belong to the 2nd
group. Fleurir is a common french verb.
Fleurir is conjugated the same way that verbs that end in : -ir
Fleurir is conjugated with auxiliary avoir
Fleurir verb is
direct transitive, intransitive.
French verb fleurir can be conjugated in the reflexive form: Se fleurir
verb is a direct transitive verb, so passive voice can be used.