I apologize for this delayed reply to your gardening question and hope it is still helpful to you.
Bleeding heart struggles in the heat of a southern summer. Your best bet is to provide it a location with a break from the hot afternoon sun. Don't overwater it but maintain moist soil. When the weather cools a bit you may find the color comes back better.
Thanks for the question. Best wishes for a wonderful gardening season. Please stop in again soon!
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