What do I do when my bird of paradise has finished flowering?
What Do I Do When My Bird of Paradise Has Finished Flowering
The only thing I'd do is remove the spent blooms. Other than that, all the plant needs is regular water and fertilizing. This is an informative article: https://www.gardeningknowhow.com/ornamental/flowers/bop/bird-of-paradise-an-exotic-flower-like-none-other.htm