Right now your new pants are getting established.
They're in shock and trying to grow their root systems. Don't expect them look good with that going on and this excessive heat and lack of rain.

Right now most of us are just trying to keep everything alive... forget the growth and blooms, and that's on well established (11 yr old) trees and shrubs.

Come end of Sept everything will look much much better. I promise. :)

I have a row of Natchez and other crape myrtles along a fence line. I trickle water them once a week. By that, I mean a fast drip overnight so it can all soak in. Top watering won't get the job done as it does not get down to the roots.

Indian Hawthorne's generally bloom earlier in the year,so you probably shouldn't expect to see any blooms till next year. You do need to deep water them instead of just letting sprinkler system run. Soaker hose or trickle for an hour or so each day until this heat breaks.