Posted: 24/05/2017 at 13:23
I have an Azalea like that. It would flower, then drop its flowers the next day and it was a boring green bush for the rest of the year. It was in my front garden, north-facing, and maybe wasn't getting enough light. I dug it up and put it in a pot and put in the back garden for more sun, but it was still dropping its flowers a day or two later. I was on the verge of giving it away (or disposing of it), but this year I moved the pot again to a new position. It's more sheltered and gets the full sun from 11am till 5pm.
This is it
and it's been like this for a good 10 days. I m really happy with it.
Maybe preserve? Try a new spot in the garden, or in my case, it could just luck and the plant maturing and now gives a better display.