lemon trees

Question

Is it safe to add dirt a few inches higher on the tree trunk?

Answer 1

No, if this is a potted Lemon Tree you will want to repot and add soil to the root system.
If this is in the ground, avoid piling soil or mulch up against the trunk; this can cause disease or death of the tree.

https://www.gardeningknowhow.com/edible/fruits/lemons/how-to-grow-a-lemon-tree.htm
https://www.gardeningknowhow.com/edible/fruits/lemons/growing-lemon-trees-containers.htm