New mango tree help please

Nathan and Bailey starts with ...
Hi everyone.

Sorry, I don’t know anything about mango trees. I’ve just found this forum. I was given a mango tree a few months ago that I’ve planted in the front yard but it just hasn’t looked very healthy since. I was hoping for some advice.

Essentially it’s just been planted in an area that was just lawn, so aside from the soil it came in, it’s basically planted in plain dirt. I have added some volcanic ash and a slow release fertiliser and it gets watered three times a week from bore reticulation.

Is it just a bit shocked from being transplanted or should I really of dug a bigger area and added proper soil? Any advice appreciated.

Thanks