I have loads of buds on my 2 hibiscus bushes but most of them do not come to full bloom. They just stay folded up and eventually drop
off. I'm watering daily for about 15 mins. I live in South FL & they get direct sun.
Certified GKH Gardening Expert
There are several possible reasons for the problem with your hibiscus plant.See article below. Plus, I wouldn't water every day (unless they are in pots that dry out quickly). Water deeply and less frequently, but keep the ground somewhat moist.
This article will help: