Avocado leaves turning brown
Over the weekend I noticed my dwarf Hashimoto avocado's leaves are turning brown and are starting to drop.
I'm not sure if it is because of frost damage, fungus or the surrounding mulch? Is it worth digging it up and putting it in a large to pot to rehabilitate it?
The plant is 2 years old and hasn't grown much despite being regularly fertilised.
The soil is volcanic with a couple of layers of mulch on it and the tree has morning sun and afternoon shade.