Hello, I have a few Asiatic Lillies I bought from Walmart maybe a month ago. Repotted in larger pot. Feed it Miracle grow Bloom Booster once if I remember correctly. Started seeing colors in the buds a week ago. They started to open and one immediately started turning brown.Not sure if Bloom Booster was a bad Idea or if something else could be the problem. It is in full sun. Any ideas what caused my problem.

Thanks

Pictures are from early morning so it has some dew on the flowers.