Answer: Coral bells can fade in the summer heat but they generally start out with a bright color and then fade. If your plants are being shaded too much, the color pigment won't develop fully. So, there has to be a happy medium between some direct sunshine but not too much hot afternoon sun. In just the right planting spot their foliage should remain a vibrant red. Try to find a place in your garden that gets morning sun and at least some protection from hot afternoon sun.
Best wishes with your garden!
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