Why do they change??

I'm adding 2 photos today, one of my Mums which were white when I planted them, and are now a rust color. I know we are in a drought here, or maybe they got sunburned.
The other is, depending on what part of the country you are in, a Beauty bush or Seatic Berry Bush. I started that in 1999 from a stem from the original bush that was at hubbies home place. It took three years to get it growing and on the 4th year a few berries. Hubby is so happy this year to see it lush and full.