
Certified GKH Gardening Expert
Unfortunately, your photos did not come through. I am unable to diagnose the issue at hand. In the meantime, these articles will help you to determine problems in your soil, and give you tips on the best care for the tree:
https://www.gardeningknowhow.com/ornamental/trees/tea-trees/australian-tea-tree-info.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/testing-soil.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/soil-ph-plants.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/test-soil-for-pests-and-diseases.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/making-sure-soil-drains-well.htm