Q.We Bought And Planted A Tree Which Has Grown Well But The Smell Off The Leaves Has Gone And The Leaves Have Changed
We bought and planted a tree 7 years ago , it’s grown well but the leaves have changed and there is no lovely eucalyptus smell from the leaves any more , why has all this happened?

Certified GKH Gardening Expert
I assume that we are talking about a Eucalyptus tree. Unfortunately, your photos did not come through. I am unable to get any clues as to what is happening. I can suggest testing the soil for pH imbalances and nutrient deficiencies. That will get you started.
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/testing-soil.htm
If everything checks out, then move on to disease. If there are no immediate signs of disease, then you might look to an environmental stress of some sort. For now, this article will help you to grow the tree, successfully:
https://www.gardeningknowhow.com/ornamental/trees/eucalyptus/tips-growing-eucalyptus.htm