You can purchase Bird of Paradise seeds from Costolot's General Store, from your seed pouch, or try talking with Seedos to see if he'll give you a seed
Terrain
Bird of Paradise flowers need to be planted in soil, grass, or long grass
Full Growth
Apply 3 doses of orange fertilizer immediately after planting for maximum effect
Benefits
Seed
Eating 3 Bird of Paradise seeds helps meet the Parrybo Resident requirements
Feeding a Bird of Paradise seed to a Bonboon or Quackberry changes their color to orange
Flower
Having a Bird of Paradise flower in the garden helps meet the Parrybo Appear requirements
Having 2 Bird of Paradise flowers in the garden helps meet the Parrybo Visit requirements
Eating 4 Bird of Paradise flowers helps meet the Chippopotamus Romance requirements
Eating a Bird of Paradise flower helps meet the Eaglair Trick requirements
Feeding a Bird of Paradise flower to a Crowla or Newtgat will change their color to orange
Feeding a Bird of Paradise flower to a White Flutterscotch will turn them into an Orange Flutterscotch