What Killed My Azaleas

Question

I have had two evergreen azaleas for 5/6 years, both grown in pots and have previously given me an abundance of flowers every spring. This year the leaves on both turned brown and the whole thing died. I checked the soil and didn’t find any insect or grubs, no powdery mildew on leaves, no galls on plant, no holes of any kind on leaves, so I am completely baffled? Please, could you tell me what you think it could be, as I would like to replace them but need to know what killed them first.

Answer 1

I am really not sure, but perhaps this article can help pinpont a likely cause:
https://www.gardeningknowhow.com/ornamental/shrubs/azalea/common-azalea-problems.htm