Rhododendron leaves curling and turning brown at edges
I have a 1 year old rhododendron plant. It was just a single branch and it has spread, become stronger over the year.
Recently, I noticed the curling of leaves, they are falling off and turning brown at edges. The leaves are shading rapidly. It is summer here, I am watering the plant / 3 days.
When I browsed through forums, there are two opposite symptoms I could see
1. Root rot
2. Lack of water
I am not sure what to do. Please advise.
I have attached photo for better look.
Please help, cant see my plant dying