Thanks for writing. Bird of paradise blooms best in a spot with full sun and well-drained soil. So be sure your plant isn't getting too much shade or it's in a spot where the soil stays too wet.
Do you feed your bird of paradise? That helps it bloom better, too --- especially if you have poor soil. You can use any general-purpose garden fertilizer. The plant responds both to organic and traditional plant foods.
---Justin, Senior Garden Editor, BHG.com