Tibouchina Is Dying Because Of Drought. How Do I Care For It To Give It The Best Chance Of Survival
It has thrived for the last two and a half years with gentle pruning and little water other than rain. Now it seems to be dying from the inside out Grace and Peace Evan
Certified GKH Gardening Expert
If there is a drought, simply provide more water. These are quite drought tolerant, though. I'm not familiar with the climate of your country, except that it is the opposite of ours at any given time, so I suspect that you are entering or are in your warm season. If it was cold during your winter, then it could still be recovering from the cool weather. They also benefit from yearly pruning. If this hasn't been done, then this could help you here, too.
This article will offer more information on the proper care of the plant: https://www.gardeningknowhow.com/ornamental/shrubs/princess-flower-bush/growing-princess-flower.htm