From Starbounder - Starbound Wiki
Yellow Flower is an object unobtainable by players through normal means. This item's information is present in the game files, but not intended by developers to be in players' possession.
Since they do not drop seeds they can not be replanted.
|Apex :||With this flower I can finally turn all my clothes yellow.|
|Avian :||The dye from yellow flowers is used a lot in Avian culture.|
|Floran :||Yellow flower sssymbolises youth in Floran culture.|
|Glitch :||Enthusiastic. A vibrant yellow flower.|
|Human :||Why do you build me up, yellow flower of unknown species?|
|Hylotl :||A delightful yellow flower.|
|Novakid :||A plain lookin' yellow flower.|