This is what happens when you combine a sunflower with the sun in the sky at late day. The intensity of color makes it look so hot it might burn your fingers if you touched it. No, I did not change this photo in any way other than some cropping. The 'glow' is what made me run for my camera in the first place and I'm happy that it was pretty much captured by the camera.
At this time of the day, the butterflies, bees, and hummingbirds are attracted to its fire, too, and all of them want to get a piece of it. When you see a flower looking like this, you can understand why it's called a sunflower.