Kurume azaleas bloom first, then grow. Their flower buds contain multiple flowers, and when in full bloom, it is congested and very heavy for branches of kurume bonsai.
This example is slightly late, but it still works. It’s also a good way to “time” the bloom, by keeping the buds that are all in the same bloom phase; removing open blooms and still-dormant blooms will make peak flowering an all-at-once spectacular!
And about as good as I had time to get it this year: