Hibiscus problem

Hello
Our Hibiscus has been growing magnificently and looked really healthy until recently. Was hoping for super flowers but unfortunately the many buds won’t fully open and some are falling off too soon. Leaves also yellowing and falling off. Any advice?

Our Hibiscus has been growing magnificently and looked really healthy until recently. Was hoping for super flowers but unfortunately the many buds won’t fully open and some are falling off too soon. Leaves also yellowing and falling off. Any advice?



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In the meantime dunk that plant in its container into a deep trug full of water and leave it there for a few hours … then take it out and let it drain.
https://forum.gardenersworld.com/discussion/1058904/plant-id#latest
I had just the same problem with one, I put it it the ground and it’s grown on beautifully, unfortunately never had a flower on it.