Quote Originally Posted by Capolista View Post
It is just a bad luck of your character ..

Go cycling map between breckenridge & ydra, you will get your purple flower sometimes soon
The drops of the flowers are random from just about anything. They use the same system that drops out Crafting Essences from just about anything.

It is just bad luck that you haven't had the remaining flower you need. It is possible for this to happen, however very unlikely.