The answer to 'tree dying' is that there can be several common causes, including disease, pests, environmental stress, or improper planting and care. Symptoms may include wilting, discolored or sparse leaves, dieback of branches, and eventually the entire tree dying. Solutions depend on the specific cause, but may involve treating diseases, controlling pests, improving soil conditions, or replacing the tree if it cannot be saved.
If the cause is not obvious, it's best to have a certified arborist inspect the tree and provide recommendations. DIY options like pruning, fertilizing, or applying pesticides can help in some cases, but more serious issues often require professional diagnosis and treatment to save the tree.