Gardens are composed of land and plants. If a person dreams tha the benefits from that garden, which may be attributed to the person indicated by the trees.
One of the dream interpreters said: The basic principle with regard to gardens is that they are indicative of seeking forgiveness a great deal,because Allah says:
A garden may also be indicative of a woman, so whoever dreams that a garden of his dried up, he will stay away from his wife, and if he irrigates it, he will have intercourse with her, but if someone elseirrigates it, that person is going to betray him by cheating with his wife.
One of the dream interpreters said: Entering an unknown garden is indicative of grief and dismissal of the governor, meaning that the one who enters a garden is looking to relax and no one seeks that butone who is distressed. Moreover, if there are unknown trees in it that is indicative of arguments.
If a sick person dreams that he entered an unknown garden,that indicates that he will die and enter Paradise. But I found this interpretation only with him, and the reason for that is obvious.