Before dawn the light is blue and dull. While it is much better than trying to shoot during mid day when the light is too bright when there are dark, black shadows, blue light looks muddy.
As soon as the sun comes up, its warmth chases the blues away and a certain glow overtakes a garden for an hour or two, most notably when you shoot toward the light and expose the camera for the shadows.
The golden glow is created somewhat artificially when you ask camera to use a shade setting for white balance (telling the camera the light is blue), which makes the sunlight more yellow than if you chose a daylight white balance (telling the camera it is sunny).
Before and After Slider
Avoiding the blue light means understanding why it looks blue in the first place, and correcting it by warming up the color temperature.