To dream of an orange tree represents a permanent or ongoing sense of effort required to feel good. A positive situation that is always requiring do something to enjoy it.
Example: A man dreamed of being bitten by a snake in an orange tree. In waking life his new apartment had been robbed. The orange tree reflected all the feeling of permanence of the apartment and all the hard work to fill it with furniture and starting a life in it.
Example 2: A man dreamed of walking through an orange grove with his dead grandfather. In waking life he was finally recovering from his grief. The orange trees reflected all the hard work it took emotionally to finally feel good again after his death.