One Time Quest
Vendor appears in Malta after 6 a.m
go to: Resting in a quiet rose garden
get rose thicket
You will need 5-6 to give her for a bouquet, they spawn in the thicket pretty quickly. The roses only blossom during summer (mud time), summer northern hemisphere meteorological time (starts June 20th).
Go back to the vendor and ask vendor rose
give rose vendor (5-6 times)
she will emote lots and eventually give you a bouquet.