this quest is broken. 150 flowers are needed 36 steps. There is 0 chance anyone would find any of the items because you hid them in meaningless middles of no where. So what I have to wait 150 days collecting flowers for a stupid quest? Who's idea was that?

Blue Rose Corolla can be bought on Gift merchants in towns. But it's easier to farm those on Chaos maps. From Loot Chests where you can get Elion's Traces Chests which contains the flowers.

This step can be really confusing to new players, specially there are tutorials available online that are outdated and may add to the confusion.