Q.Bird Of Paradise Blooms Rot Before Fully Developing
I have several Bird of Paradise which were from 1 plant years ago. I have yet to get a complete bloom. They always seem to rot at the base. I have loads of blooms on my plants right now that are on the back porch, which is closed in. Today my husband put up some grow lights, I thought maybe that would help. But even last year in the yard I didn’t get a pretty bloom. Please I need help.

Certified GKH Gardening Expert
There aren't many diseases that attack this plant, but root rot, and insect problems do crop up from time to time.
With that being said, fungicides and insecticides would be my first trial.
I would look at the soil nutrients and pH also. This being out of balance will cause blooming problems, as well.
Here are some articles that will help:
https://www.gardeningknowhow.com/ornamental/flowers/bop/bird-of-paradise-plant-diseases.htm
https://www.gardeningknowhow.com/ornamental/flowers/bop/bird-of-paradise-plant-bugs.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/testing-soil.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/soil-ph-plants.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/testing-moisture-in-plants.htm