The Tree and Sickness
Interpreters have reported that a sick person seeing himself associated with a tree may indicate his fate. If the tree is in its prime and water flows through it, it may suggest the patient's recovery and health. However, if it is in decline, it may indicate approaching death and demise. The interpretation for a living person varies depending on their life context; it may indicate marriage, sustenance, religion, or assuming leadership positions if they own many trees.
Per Ibn Sirin's Muntakhab al-Kalam fi Tafsir al-Ahlam